possible deadlock in ipv6_frag_rcv (2)
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syzbot
Oct 5, 2019, 2:12:09 PM10/5/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=164352af600000
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=f7458059ff344959d50d
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f74580...@syzkaller.appspotmail.com
audit_printk_skb: 12 callbacks suppressed
======================================================
audit: type=1400 audit(1570295467.163:299): avc: denied { dyntransition }
for pid=6717 comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
[ INFO: possible circular locking dependency detected ]
4.4.174+ #4 Not tainted
-------------------------------------------------------
syz-executor.1/6726 is trying to acquire lock:
(_xmit_NETROM){+.-...}, at: [ 171.225454] audit: type=1400
audit(1570295467.173:300): avc: denied { dyntransition } for pid=6734
comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
[<ffffffff822b1b58>] spin_lock include/linux/spinlock.h:302 [inline]
[<ffffffff822b1b58>] __netif_tx_lock include/linux/netdevice.h:3306 [inline]
[<ffffffff822b1b58>] sch_direct_xmit+0x238/0x700 net/sched/sch_generic.c:163
but task is already holding lock:
(&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>] spin_lock
include/linux/spinlock.h:302 [inline]
(&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>]
ipv6_frag_rcv+0x6cc/0x51e0 net/ipv6/reassembly.c:528
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff82717e50>] __raw_spin_lock_irqsave
include/linux/spinlock_api_smp.h:112 [inline]
[<ffffffff82717e50>] _raw_spin_lock_irqsave+0x50/0x70
kernel/locking/spinlock.c:159
[<ffffffff811e8e3e>] __wake_up+0x1e/0x50 kernel/sched/wait.c:94
[<ffffffff81c7f5be>] tty_wakeup+0x5e/0x100 drivers/tty/tty_io.c:598
[<ffffffff81c83639>] __start_tty.part.0+0xd9/0x100
drivers/tty/tty_io.c:1021
[<ffffffff81c836cd>] __start_tty drivers/tty/tty_io.c:1016 [inline]
[<ffffffff81c836cd>] start_tty+0x6d/0x90 drivers/tty/tty_io.c:1029
[<ffffffff81c91bad>] n_tty_receive_signal_char+0xdd/0x100
drivers/tty/n_tty.c:1274
[<ffffffff81c92d1f>] n_tty_receive_char_special+0x114f/0x2bf0
drivers/tty/n_tty.c:1321
[<ffffffff81c95dae>] n_tty_receive_buf_fast drivers/tty/n_tty.c:1642
[inline]
[<ffffffff81c95dae>] __receive_buf drivers/tty/n_tty.c:1676 [inline]
[<ffffffff81c95dae>] n_tty_receive_buf_common+0x15ee/0x24a0
drivers/tty/n_tty.c:1774
[<ffffffff81c96c94>] n_tty_receive_buf2+0x34/0x40
drivers/tty/n_tty.c:1809
[<ffffffff81ca04b8>] receive_buf drivers/tty/tty_buffer.c:451
[inline]
[<ffffffff81ca04b8>] flush_to_ldisc+0x288/0x530
drivers/tty/tty_buffer.c:518
[<ffffffff81122c25>] process_one_work+0x825/0x1720
kernel/workqueue.c:2064
[<ffffffff81124004>] worker_thread+0x4e4/0xf50
kernel/workqueue.c:2196
[<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
[<ffffffff82718fc5>] ret_from_fork+0x55/0x80
arch/x86/entry/entry_64.S:537
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853
[inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958
[inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144
[inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff82717c98>] __raw_spin_lock
include/linux/spinlock_api_smp.h:144 [inline]
[<ffffffff82717c98>] _raw_spin_lock+0x38/0x50
kernel/locking/spinlock.c:151
[<ffffffff822b1b58>] spin_lock include/linux/spinlock.h:302 [inline]
[<ffffffff822b1b58>] __netif_tx_lock include/linux/netdevice.h:3306
[inline]
[<ffffffff822b1b58>] sch_direct_xmit+0x238/0x700
net/sched/sch_generic.c:163
[<ffffffff82246aa4>] __dev_xmit_skb net/core/dev.c:2979 [inline]
[<ffffffff82246aa4>] __dev_queue_xmit+0xd24/0x1bb0
net/core/dev.c:3197
[<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
[<ffffffff822677e0>] neigh_resolve_output+0x4a0/0x7a0
net/core/neighbour.c:1329
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240
[inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826036dd>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826036dd>] NF_HOOK_THRESH include/linux/netfilter.h:226
[inline]
[<ffffffff826036dd>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff826036dd>] ndisc_send_skb+0x98d/0x1110 net/ipv6/ndisc.c:471
[<ffffffff82606cef>] ndisc_send_ns+0x4bf/0x6b0 net/ipv6/ndisc.c:595
[<ffffffff82607192>] ndisc_solicit+0x2b2/0x440 net/ipv6/ndisc.c:686
[<ffffffff8225b508>] neigh_probe+0xc8/0x100 net/core/neighbour.c:871
[<ffffffff8226699b>] __neigh_event_send+0x2ab/0xc50
net/core/neighbour.c:1027
[<ffffffff8226792c>] neigh_event_send include/net/neighbour.h:431
[inline]
[<ffffffff8226792c>] neigh_resolve_output+0x5ec/0x7a0
net/core/neighbour.c:1313
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240
[inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826bf66c>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826bf66c>] ip6_local_out+0x9c/0x180
net/ipv6/output_core.c:169
[<ffffffff825b28c2>] ip6_send_skb+0xa2/0x340
net/ipv6/ip6_output.c:1725
[<ffffffff825b2c1b>] ip6_push_pending_frames+0xbb/0xe0
net/ipv6/ip6_output.c:1745
[<ffffffff82620f66>] icmpv6_push_pending_frames+0x336/0x530
net/ipv6/icmp.c:276
[<ffffffff82622666>] icmp6_send+0x1506/0x1b40 net/ipv6/icmp.c:537
[<ffffffff82624099>] icmpv6_param_prob+0x29/0x40 net/ipv6/icmp.c:551
[<ffffffff8263e655>] ip6_frag_queue net/ipv6/reassembly.c:190
[inline]
[<ffffffff8263e655>] ipv6_frag_rcv+0x3ce5/0x51e0
net/ipv6/reassembly.c:531
[<ffffffff825b3c1d>] ip6_input_finish+0x57d/0x14f0
net/ipv6/ip6_input.c:248
[<ffffffff825b66a8>] NF_HOOK_THRESH include/linux/netfilter.h:226
[inline]
[<ffffffff825b66a8>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b66a8>] ip6_input+0xf8/0x1f0 net/ipv6/ip6_input.c:280
[<ffffffff825b317d>] dst_input include/net/dst.h:504 [inline]
[<ffffffff825b317d>] ip6_rcv_finish+0x14d/0x670
net/ipv6/ip6_input.c:62
[<ffffffff825b5b51>] NF_HOOK_THRESH include/linux/netfilter.h:226
[inline]
[<ffffffff825b5b51>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b5b51>] ipv6_rcv+0xfc1/0x1a20 net/ipv6/ip6_input.c:186
[<ffffffff82230640>] __netif_receive_skb_core+0x1300/0x2950
net/core/dev.c:4041
[<ffffffff82238bd8>] __netif_receive_skb+0x58/0x1c0
net/core/dev.c:4076
[<ffffffff8223fec0>] process_backlog+0x200/0x630 net/core/dev.c:4673
[<ffffffff8223f2f7>] napi_poll net/core/dev.c:4911 [inline]
[<ffffffff8223f2f7>] net_rx_action+0x367/0xd30 net/core/dev.c:4976
[<ffffffff8271bb16>] __do_softirq+0x226/0xa3f kernel/softirq.c:273
[<ffffffff82719cdc>] do_softirq_own_stack+0x1c/0x30
arch/x86/entry/entry_64.S:956
[<ffffffff810e1744>] do_softirq.part.0+0x54/0x60 kernel/softirq.c:317
[<ffffffff810e18a8>] do_softirq+0x18/0x20 kernel/softirq.c:305
[<ffffffff8222ec4b>] netif_rx_ni+0xeb/0x3b0 net/core/dev.c:3675
[<ffffffff81e22f6f>] tun_get_user+0xdbf/0x2640 drivers/net/tun.c:1264
[<ffffffff81e24a0a>] tun_chr_write_iter+0xda/0x190
drivers/net/tun.c:1283
[<ffffffff81497941>] do_iter_readv_writev+0x141/0x1e0
fs/read_write.c:666
[<ffffffff81498cf7>] do_readv_writev+0x387/0x6e0 fs/read_write.c:810
[<ffffffff8149917d>] vfs_writev+0x7d/0xb0 fs/read_write.c:849
[<ffffffff8149b5fc>] SYSC_writev fs/read_write.c:882 [inline]
[<ffffffff8149b5fc>] SyS_writev+0xdc/0x260 fs/read_write.c:874
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&q->lock)->rlock);
lock(_xmit_NETROM);
lock(&(&q->lock)->rlock);
lock(_xmit_NETROM);
*** DEADLOCK ***
9 locks held by syz-executor.1/6726:
#0: (rcu_read_lock){......}, at: [<ffffffff8223fe5c>] __skb_unlink
include/linux/skbuff.h:1648 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff8223fe5c>] __skb_dequeue
include/linux/skbuff.h:1664 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff8223fe5c>]
process_backlog+0x19c/0x630 net/core/dev.c:4670
#1: (rcu_read_lock){......}, at: [<ffffffff825b36a0>]
ip6_input_finish+0x0/0x14f0 net/ipv6/ip6_input.c:55
#2: (&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>] spin_lock
include/linux/spinlock.h:302 [inline]
#2: (&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>]
ipv6_frag_rcv+0x6cc/0x51e0 net/ipv6/reassembly.c:528
#3: (slock-AF_INET6){+.-...}, at: [<ffffffff8262191d>] spin_trylock
include/linux/spinlock.h:312 [inline]
#3: (slock-AF_INET6){+.-...}, at: [<ffffffff8262191d>] icmpv6_xmit_lock
net/ipv6/icmp.c:120 [inline]
#3: (slock-AF_INET6){+.-...}, at: [<ffffffff8262191d>]
icmp6_send+0x7bd/0x1b40 net/ipv6/icmp.c:485
#4: (rcu_read_lock){......}, at: [<ffffffff826220a4>]
icmp6_send+0xf44/0x1b40 net/ipv6/icmp.c:517
#5: (rcu_read_lock_bh){......}, at: [<ffffffff8259f091>]
ip6_finish_output2+0x1e1/0x1dc0 net/ipv6/ip6_output.c:71
#6: (rcu_read_lock){......}, at: [<ffffffff826034c9>] ip6_nd_hdr
net/ipv6/ndisc.c:427 [inline]
#6: (rcu_read_lock){......}, at: [<ffffffff826034c9>]
ndisc_send_skb+0x779/0x1110 net/ipv6/ndisc.c:465
#7: (rcu_read_lock_bh){......}, at: [<ffffffff8259f091>]
ip6_finish_output2+0x1e1/0x1dc0 net/ipv6/ip6_output.c:71
#8: (rcu_read_lock_bh){......}, at: [<ffffffff82245f57>]
__dev_queue_xmit+0x1d7/0x1bb0 net/core/dev.c:3161
stack backtrace:
CPU: 0 PID: 6726 Comm: syz-executor.1 Not tainted 4.4.174+ #4
0000000000000000 5131b962d8359778 ffff8801db6064e0 ffffffff81aad1a1
ffffffff84057a80 ffff8801bda00000 ffffffff83ad5370 ffffffff83ad96f0
ffffffff83ad5370 ffff8801db606530 ffffffff813abcda ffff8801db606610
Call Trace:
<IRQ> [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
<IRQ> [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<ffffffff813abcda>] print_circular_bug.cold+0x2f7/0x44e
kernel/locking/lockdep.c:1226
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853 [inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958 [inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144 [inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592
[<ffffffff82717c98>] __raw_spin_lock include/linux/spinlock_api_smp.h:144
[inline]
[<ffffffff82717c98>] _raw_spin_lock+0x38/0x50 kernel/locking/spinlock.c:151
[<ffffffff822b1b58>] spin_lock include/linux/spinlock.h:302 [inline]
[<ffffffff822b1b58>] __netif_tx_lock include/linux/netdevice.h:3306
[inline]
[<ffffffff822b1b58>] sch_direct_xmit+0x238/0x700
net/sched/sch_generic.c:163
[<ffffffff82246aa4>] __dev_xmit_skb net/core/dev.c:2979 [inline]
[<ffffffff82246aa4>] __dev_queue_xmit+0xd24/0x1bb0 net/core/dev.c:3197
[<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
[<ffffffff822677e0>] neigh_resolve_output+0x4a0/0x7a0
net/core/neighbour.c:1329
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826036dd>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826036dd>] NF_HOOK_THRESH include/linux/netfilter.h:226 [inline]
[<ffffffff826036dd>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff826036dd>] ndisc_send_skb+0x98d/0x1110 net/ipv6/ndisc.c:471
[<ffffffff82606cef>] ndisc_send_ns+0x4bf/0x6b0 net/ipv6/ndisc.c:595
[<ffffffff82607192>] ndisc_solicit+0x2b2/0x440 net/ipv6/ndisc.c:686
[<ffffffff8225b508>] neigh_probe+0xc8/0x100 net/core/neighbour.c:871
[<ffffffff8226699b>] __neigh_event_send+0x2ab/0xc50
net/core/neighbour.c:1027
[<ffffffff8226792c>] neigh_event_send include/net/neighbour.h:431 [inline]
[<ffffffff8226792c>] neigh_resolve_output+0x5ec/0x7a0
net/core/neighbour.c:1313
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826bf66c>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826bf66c>] ip6_local_out+0x9c/0x180 net/ipv6/output_core.c:169
[<ffffffff825b28c2>] ip6_send_skb+0xa2/0x340 net/ipv6/ip6_output.c:1725
[<ffffffff825b2c1b>] ip6_push_pending_frames+0xbb/0xe0
net/ipv6/ip6_output.c:1745
[<ffffffff82620f66>] icmpv6_push_pending_frames+0x336/0x530
net/ipv6/icmp.c:276
[<ffffffff82622666>] icmp6_send+0x1506/0x1b40 net/ipv6/icmp.c:537
[<ffffffff82624099>] icmpv6_param_prob+0x29/0x40 net/ipv6/icmp.c:551
[<ffffffff8263e655>] ip6_frag_queue net/ipv6/reassembly.c:190 [inline]
[<ffffffff8263e655>] ipv6_frag_rcv+0x3ce5/0x51e0 net/ipv6/reassembly.c:531
[<ffffffff825b3c1d>] ip6_input_finish+0x57d/0x14f0 net/ipv6/ip6_input.c:248
[<ffffffff825b66a8>] NF_HOOK_THRESH include/linux/netfilter.h:226 [inline]
[<ffffffff825b66a8>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b66a8>] ip6_input+0xf8/0x1f0 net/ipv6/ip6_input.c:280
[<ffffffff825b317d>] dst_input include/net/dst.h:504 [inline]
[<ffffffff825b317d>] ip6_rcv_finish+0x14d/0x670 net/ipv6/ip6_input.c:62
[<ffffffff825b5b51>] NF_HOOK_THRESH include/linux/netfilter.h:226 [inline]
[<ffffffff825b5b51>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b5b51>] ipv6_rcv+0xfc1/0x1a20 net/ipv6/ip6_input.c:186
[<ffffffff82230640>] __netif_receive_skb_core+0x1300/0x2950
net/core/dev.c:4041
[<ffffffff82238bd8>] __netif_receive_skb+0x58/0x1c0 net/core/dev.c:4076
[<ffffffff8223fec0>] process_backlog+0x200/0x630 net/core/dev.c:4673
[<ffffffff8223f2f7>] napi_poll net/core/dev.c:4911 [inline]
[<ffffffff8223f2f7>] net_rx_action+0x367/0xd30 net/core/dev.c:4976
[<ffffffff8271bb16>] __do_softirq+0x226/0xa3f kernel/softirq.c:273
[<ffffffff82719cdc>] do_softirq_own_stack+0x1c/0x30
arch/x86/entry/entry_64.S:956
<EOI> [<ffffffff810e1744>] do_softirq.part.0+0x54/0x60
kernel/softirq.c:317
[<ffffffff810e18a8>] do_softirq+0x18/0x20 kernel/softirq.c:305
[<ffffffff8222ec4b>] netif_rx_ni+0xeb/0x3b0 net/core/dev.c:3675
[<ffffffff81e22f6f>] tun_get_user+0xdbf/0x2640 drivers/net/tun.c:1264
[<ffffffff81e24a0a>] tun_chr_write_iter+0xda/0x190 drivers/net/tun.c:1283
[<ffffffff81497941>] do_iter_readv_writev+0x141/0x1e0 fs/read_write.c:666
[<ffffffff81498cf7>] do_readv_writev+0x387/0x6e0 fs/read_write.c:810
[<ffffffff8149917d>] vfs_writev+0x7d/0xb0 fs/read_write.c:849
[<ffffffff8149b5fc>] SYSC_writev fs/read_write.c:882 [inline]
[<ffffffff8149b5fc>] SyS_writev+0xdc/0x260 fs/read_write.c:874
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
audit: type=1400 audit(1570295470.103:301): avc: denied { dyntransition }
for pid=6750 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
audit: type=1400 audit(1570295470.123:302): avc: denied { dyntransition }
for pid=6754 comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
audit: type=1400 audit(1570295470.153:303): avc: denied { dyntransition }
for pid=6762 comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
binder: 6976:6981 ioctl c0306201 0 returned -14
binder: 6987:6992 ioctl c0306201 0 returned -14
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
binder: 7003:7010 ioctl c0306201 0 returned -14
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=164352af600000
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=f7458059ff344959d50d
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f74580...@syzkaller.appspotmail.com
audit_printk_skb: 12 callbacks suppressed
======================================================
audit: type=1400 audit(1570295467.163:299): avc: denied { dyntransition }
for pid=6717 comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
[ INFO: possible circular locking dependency detected ]
4.4.174+ #4 Not tainted
-------------------------------------------------------
syz-executor.1/6726 is trying to acquire lock:
(_xmit_NETROM){+.-...}, at: [ 171.225454] audit: type=1400
audit(1570295467.173:300): avc: denied { dyntransition } for pid=6734
comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
[<ffffffff822b1b58>] spin_lock include/linux/spinlock.h:302 [inline]
[<ffffffff822b1b58>] __netif_tx_lock include/linux/netdevice.h:3306 [inline]
[<ffffffff822b1b58>] sch_direct_xmit+0x238/0x700 net/sched/sch_generic.c:163
but task is already holding lock:
(&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>] spin_lock
include/linux/spinlock.h:302 [inline]
(&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>]
ipv6_frag_rcv+0x6cc/0x51e0 net/ipv6/reassembly.c:528
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff82717e50>] __raw_spin_lock_irqsave
include/linux/spinlock_api_smp.h:112 [inline]
[<ffffffff82717e50>] _raw_spin_lock_irqsave+0x50/0x70
kernel/locking/spinlock.c:159
[<ffffffff811e8e3e>] __wake_up+0x1e/0x50 kernel/sched/wait.c:94
[<ffffffff81c7f5be>] tty_wakeup+0x5e/0x100 drivers/tty/tty_io.c:598
[<ffffffff81c83639>] __start_tty.part.0+0xd9/0x100
drivers/tty/tty_io.c:1021
[<ffffffff81c836cd>] __start_tty drivers/tty/tty_io.c:1016 [inline]
[<ffffffff81c836cd>] start_tty+0x6d/0x90 drivers/tty/tty_io.c:1029
[<ffffffff81c91bad>] n_tty_receive_signal_char+0xdd/0x100
drivers/tty/n_tty.c:1274
[<ffffffff81c92d1f>] n_tty_receive_char_special+0x114f/0x2bf0
drivers/tty/n_tty.c:1321
[<ffffffff81c95dae>] n_tty_receive_buf_fast drivers/tty/n_tty.c:1642
[inline]
[<ffffffff81c95dae>] __receive_buf drivers/tty/n_tty.c:1676 [inline]
[<ffffffff81c95dae>] n_tty_receive_buf_common+0x15ee/0x24a0
drivers/tty/n_tty.c:1774
[<ffffffff81c96c94>] n_tty_receive_buf2+0x34/0x40
drivers/tty/n_tty.c:1809
[<ffffffff81ca04b8>] receive_buf drivers/tty/tty_buffer.c:451
[inline]
[<ffffffff81ca04b8>] flush_to_ldisc+0x288/0x530
drivers/tty/tty_buffer.c:518
[<ffffffff81122c25>] process_one_work+0x825/0x1720
kernel/workqueue.c:2064
[<ffffffff81124004>] worker_thread+0x4e4/0xf50
kernel/workqueue.c:2196
[<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
[<ffffffff82718fc5>] ret_from_fork+0x55/0x80
arch/x86/entry/entry_64.S:537
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853
[inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958
[inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144
[inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450
kernel/locking/lockdep.c:3592
[<ffffffff82717c98>] __raw_spin_lock
include/linux/spinlock_api_smp.h:144 [inline]
[<ffffffff82717c98>] _raw_spin_lock+0x38/0x50
kernel/locking/spinlock.c:151
[<ffffffff822b1b58>] spin_lock include/linux/spinlock.h:302 [inline]
[<ffffffff822b1b58>] __netif_tx_lock include/linux/netdevice.h:3306
[inline]
[<ffffffff822b1b58>] sch_direct_xmit+0x238/0x700
net/sched/sch_generic.c:163
[<ffffffff82246aa4>] __dev_xmit_skb net/core/dev.c:2979 [inline]
[<ffffffff82246aa4>] __dev_queue_xmit+0xd24/0x1bb0
net/core/dev.c:3197
[<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
[<ffffffff822677e0>] neigh_resolve_output+0x4a0/0x7a0
net/core/neighbour.c:1329
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240
[inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826036dd>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826036dd>] NF_HOOK_THRESH include/linux/netfilter.h:226
[inline]
[<ffffffff826036dd>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff826036dd>] ndisc_send_skb+0x98d/0x1110 net/ipv6/ndisc.c:471
[<ffffffff82606cef>] ndisc_send_ns+0x4bf/0x6b0 net/ipv6/ndisc.c:595
[<ffffffff82607192>] ndisc_solicit+0x2b2/0x440 net/ipv6/ndisc.c:686
[<ffffffff8225b508>] neigh_probe+0xc8/0x100 net/core/neighbour.c:871
[<ffffffff8226699b>] __neigh_event_send+0x2ab/0xc50
net/core/neighbour.c:1027
[<ffffffff8226792c>] neigh_event_send include/net/neighbour.h:431
[inline]
[<ffffffff8226792c>] neigh_resolve_output+0x5ec/0x7a0
net/core/neighbour.c:1313
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240
[inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826bf66c>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826bf66c>] ip6_local_out+0x9c/0x180
net/ipv6/output_core.c:169
[<ffffffff825b28c2>] ip6_send_skb+0xa2/0x340
net/ipv6/ip6_output.c:1725
[<ffffffff825b2c1b>] ip6_push_pending_frames+0xbb/0xe0
net/ipv6/ip6_output.c:1745
[<ffffffff82620f66>] icmpv6_push_pending_frames+0x336/0x530
net/ipv6/icmp.c:276
[<ffffffff82622666>] icmp6_send+0x1506/0x1b40 net/ipv6/icmp.c:537
[<ffffffff82624099>] icmpv6_param_prob+0x29/0x40 net/ipv6/icmp.c:551
[<ffffffff8263e655>] ip6_frag_queue net/ipv6/reassembly.c:190
[inline]
[<ffffffff8263e655>] ipv6_frag_rcv+0x3ce5/0x51e0
net/ipv6/reassembly.c:531
[<ffffffff825b3c1d>] ip6_input_finish+0x57d/0x14f0
net/ipv6/ip6_input.c:248
[<ffffffff825b66a8>] NF_HOOK_THRESH include/linux/netfilter.h:226
[inline]
[<ffffffff825b66a8>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b66a8>] ip6_input+0xf8/0x1f0 net/ipv6/ip6_input.c:280
[<ffffffff825b317d>] dst_input include/net/dst.h:504 [inline]
[<ffffffff825b317d>] ip6_rcv_finish+0x14d/0x670
net/ipv6/ip6_input.c:62
[<ffffffff825b5b51>] NF_HOOK_THRESH include/linux/netfilter.h:226
[inline]
[<ffffffff825b5b51>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b5b51>] ipv6_rcv+0xfc1/0x1a20 net/ipv6/ip6_input.c:186
[<ffffffff82230640>] __netif_receive_skb_core+0x1300/0x2950
net/core/dev.c:4041
[<ffffffff82238bd8>] __netif_receive_skb+0x58/0x1c0
net/core/dev.c:4076
[<ffffffff8223fec0>] process_backlog+0x200/0x630 net/core/dev.c:4673
[<ffffffff8223f2f7>] napi_poll net/core/dev.c:4911 [inline]
[<ffffffff8223f2f7>] net_rx_action+0x367/0xd30 net/core/dev.c:4976
[<ffffffff8271bb16>] __do_softirq+0x226/0xa3f kernel/softirq.c:273
[<ffffffff82719cdc>] do_softirq_own_stack+0x1c/0x30
arch/x86/entry/entry_64.S:956
[<ffffffff810e1744>] do_softirq.part.0+0x54/0x60 kernel/softirq.c:317
[<ffffffff810e18a8>] do_softirq+0x18/0x20 kernel/softirq.c:305
[<ffffffff8222ec4b>] netif_rx_ni+0xeb/0x3b0 net/core/dev.c:3675
[<ffffffff81e22f6f>] tun_get_user+0xdbf/0x2640 drivers/net/tun.c:1264
[<ffffffff81e24a0a>] tun_chr_write_iter+0xda/0x190
drivers/net/tun.c:1283
[<ffffffff81497941>] do_iter_readv_writev+0x141/0x1e0
fs/read_write.c:666
[<ffffffff81498cf7>] do_readv_writev+0x387/0x6e0 fs/read_write.c:810
[<ffffffff8149917d>] vfs_writev+0x7d/0xb0 fs/read_write.c:849
[<ffffffff8149b5fc>] SYSC_writev fs/read_write.c:882 [inline]
[<ffffffff8149b5fc>] SyS_writev+0xdc/0x260 fs/read_write.c:874
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&q->lock)->rlock);
lock(_xmit_NETROM);
lock(&(&q->lock)->rlock);
lock(_xmit_NETROM);
*** DEADLOCK ***
9 locks held by syz-executor.1/6726:
#0: (rcu_read_lock){......}, at: [<ffffffff8223fe5c>] __skb_unlink
include/linux/skbuff.h:1648 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff8223fe5c>] __skb_dequeue
include/linux/skbuff.h:1664 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff8223fe5c>]
process_backlog+0x19c/0x630 net/core/dev.c:4670
#1: (rcu_read_lock){......}, at: [<ffffffff825b36a0>]
ip6_input_finish+0x0/0x14f0 net/ipv6/ip6_input.c:55
#2: (&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>] spin_lock
include/linux/spinlock.h:302 [inline]
#2: (&(&q->lock)->rlock){+.-...}, at: [<ffffffff8263b03c>]
ipv6_frag_rcv+0x6cc/0x51e0 net/ipv6/reassembly.c:528
#3: (slock-AF_INET6){+.-...}, at: [<ffffffff8262191d>] spin_trylock
include/linux/spinlock.h:312 [inline]
#3: (slock-AF_INET6){+.-...}, at: [<ffffffff8262191d>] icmpv6_xmit_lock
net/ipv6/icmp.c:120 [inline]
#3: (slock-AF_INET6){+.-...}, at: [<ffffffff8262191d>]
icmp6_send+0x7bd/0x1b40 net/ipv6/icmp.c:485
#4: (rcu_read_lock){......}, at: [<ffffffff826220a4>]
icmp6_send+0xf44/0x1b40 net/ipv6/icmp.c:517
#5: (rcu_read_lock_bh){......}, at: [<ffffffff8259f091>]
ip6_finish_output2+0x1e1/0x1dc0 net/ipv6/ip6_output.c:71
#6: (rcu_read_lock){......}, at: [<ffffffff826034c9>] ip6_nd_hdr
net/ipv6/ndisc.c:427 [inline]
#6: (rcu_read_lock){......}, at: [<ffffffff826034c9>]
ndisc_send_skb+0x779/0x1110 net/ipv6/ndisc.c:465
#7: (rcu_read_lock_bh){......}, at: [<ffffffff8259f091>]
ip6_finish_output2+0x1e1/0x1dc0 net/ipv6/ip6_output.c:71
#8: (rcu_read_lock_bh){......}, at: [<ffffffff82245f57>]
__dev_queue_xmit+0x1d7/0x1bb0 net/core/dev.c:3161
stack backtrace:
CPU: 0 PID: 6726 Comm: syz-executor.1 Not tainted 4.4.174+ #4
0000000000000000 5131b962d8359778 ffff8801db6064e0 ffffffff81aad1a1
ffffffff84057a80 ffff8801bda00000 ffffffff83ad5370 ffffffff83ad96f0
ffffffff83ad5370 ffff8801db606530 ffffffff813abcda ffff8801db606610
Call Trace:
<IRQ> [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
<IRQ> [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<ffffffff813abcda>] print_circular_bug.cold+0x2f7/0x44e
kernel/locking/lockdep.c:1226
[<ffffffff81202d86>] check_prev_add kernel/locking/lockdep.c:1853 [inline]
[<ffffffff81202d86>] check_prevs_add kernel/locking/lockdep.c:1958 [inline]
[<ffffffff81202d86>] validate_chain kernel/locking/lockdep.c:2144 [inline]
[<ffffffff81202d86>] __lock_acquire+0x37d6/0x4f50
kernel/locking/lockdep.c:3213
[<ffffffff81205f6e>] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592
[<ffffffff82717c98>] __raw_spin_lock include/linux/spinlock_api_smp.h:144
[inline]
[<ffffffff82717c98>] _raw_spin_lock+0x38/0x50 kernel/locking/spinlock.c:151
[<ffffffff822b1b58>] spin_lock include/linux/spinlock.h:302 [inline]
[<ffffffff822b1b58>] __netif_tx_lock include/linux/netdevice.h:3306
[inline]
[<ffffffff822b1b58>] sch_direct_xmit+0x238/0x700
net/sched/sch_generic.c:163
[<ffffffff82246aa4>] __dev_xmit_skb net/core/dev.c:2979 [inline]
[<ffffffff82246aa4>] __dev_queue_xmit+0xd24/0x1bb0 net/core/dev.c:3197
[<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263
[<ffffffff822677e0>] neigh_resolve_output+0x4a0/0x7a0
net/core/neighbour.c:1329
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826036dd>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826036dd>] NF_HOOK_THRESH include/linux/netfilter.h:226 [inline]
[<ffffffff826036dd>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff826036dd>] ndisc_send_skb+0x98d/0x1110 net/ipv6/ndisc.c:471
[<ffffffff82606cef>] ndisc_send_ns+0x4bf/0x6b0 net/ipv6/ndisc.c:595
[<ffffffff82607192>] ndisc_solicit+0x2b2/0x440 net/ipv6/ndisc.c:686
[<ffffffff8225b508>] neigh_probe+0xc8/0x100 net/core/neighbour.c:871
[<ffffffff8226699b>] __neigh_event_send+0x2ab/0xc50
net/core/neighbour.c:1027
[<ffffffff8226792c>] neigh_event_send include/net/neighbour.h:431 [inline]
[<ffffffff8226792c>] neigh_resolve_output+0x5ec/0x7a0
net/core/neighbour.c:1313
[<ffffffff8259f877>] dst_neigh_output include/net/dst.h:461 [inline]
[<ffffffff8259f877>] ip6_finish_output2+0x9c7/0x1dc0
net/ipv6/ip6_output.c:113
[<ffffffff825b0203>] ip6_finish_output+0x2f3/0x750
net/ipv6/ip6_output.c:131
[<ffffffff825b0814>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
[<ffffffff825b0814>] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145
[<ffffffff826bf66c>] dst_output include/net/dst.h:498 [inline]
[<ffffffff826bf66c>] ip6_local_out+0x9c/0x180 net/ipv6/output_core.c:169
[<ffffffff825b28c2>] ip6_send_skb+0xa2/0x340 net/ipv6/ip6_output.c:1725
[<ffffffff825b2c1b>] ip6_push_pending_frames+0xbb/0xe0
net/ipv6/ip6_output.c:1745
[<ffffffff82620f66>] icmpv6_push_pending_frames+0x336/0x530
net/ipv6/icmp.c:276
[<ffffffff82622666>] icmp6_send+0x1506/0x1b40 net/ipv6/icmp.c:537
[<ffffffff82624099>] icmpv6_param_prob+0x29/0x40 net/ipv6/icmp.c:551
[<ffffffff8263e655>] ip6_frag_queue net/ipv6/reassembly.c:190 [inline]
[<ffffffff8263e655>] ipv6_frag_rcv+0x3ce5/0x51e0 net/ipv6/reassembly.c:531
[<ffffffff825b3c1d>] ip6_input_finish+0x57d/0x14f0 net/ipv6/ip6_input.c:248
[<ffffffff825b66a8>] NF_HOOK_THRESH include/linux/netfilter.h:226 [inline]
[<ffffffff825b66a8>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b66a8>] ip6_input+0xf8/0x1f0 net/ipv6/ip6_input.c:280
[<ffffffff825b317d>] dst_input include/net/dst.h:504 [inline]
[<ffffffff825b317d>] ip6_rcv_finish+0x14d/0x670 net/ipv6/ip6_input.c:62
[<ffffffff825b5b51>] NF_HOOK_THRESH include/linux/netfilter.h:226 [inline]
[<ffffffff825b5b51>] NF_HOOK include/linux/netfilter.h:249 [inline]
[<ffffffff825b5b51>] ipv6_rcv+0xfc1/0x1a20 net/ipv6/ip6_input.c:186
[<ffffffff82230640>] __netif_receive_skb_core+0x1300/0x2950
net/core/dev.c:4041
[<ffffffff82238bd8>] __netif_receive_skb+0x58/0x1c0 net/core/dev.c:4076
[<ffffffff8223fec0>] process_backlog+0x200/0x630 net/core/dev.c:4673
[<ffffffff8223f2f7>] napi_poll net/core/dev.c:4911 [inline]
[<ffffffff8223f2f7>] net_rx_action+0x367/0xd30 net/core/dev.c:4976
[<ffffffff8271bb16>] __do_softirq+0x226/0xa3f kernel/softirq.c:273
[<ffffffff82719cdc>] do_softirq_own_stack+0x1c/0x30
arch/x86/entry/entry_64.S:956
<EOI> [<ffffffff810e1744>] do_softirq.part.0+0x54/0x60
kernel/softirq.c:317
[<ffffffff810e18a8>] do_softirq+0x18/0x20 kernel/softirq.c:305
[<ffffffff8222ec4b>] netif_rx_ni+0xeb/0x3b0 net/core/dev.c:3675
[<ffffffff81e22f6f>] tun_get_user+0xdbf/0x2640 drivers/net/tun.c:1264
[<ffffffff81e24a0a>] tun_chr_write_iter+0xda/0x190 drivers/net/tun.c:1283
[<ffffffff81497941>] do_iter_readv_writev+0x141/0x1e0 fs/read_write.c:666
[<ffffffff81498cf7>] do_readv_writev+0x387/0x6e0 fs/read_write.c:810
[<ffffffff8149917d>] vfs_writev+0x7d/0xb0 fs/read_write.c:849
[<ffffffff8149b5fc>] SYSC_writev fs/read_write.c:882 [inline]
[<ffffffff8149b5fc>] SyS_writev+0xdc/0x260 fs/read_write.c:874
[<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
audit: type=1400 audit(1570295470.103:301): avc: denied { dyntransition }
for pid=6750 comm="syz-executor.1"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
audit: type=1400 audit(1570295470.123:302): avc: denied { dyntransition }
for pid=6754 comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
audit: type=1400 audit(1570295470.153:303): avc: denied { dyntransition }
for pid=6762 comm="syz-executor.0"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c102 tclass=process
permissive=0
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
binder: 6976:6981 ioctl c0306201 0 returned -14
binder: 6987:6992 ioctl c0306201 0 returned -14
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
binder: 7003:7010 ioctl c0306201 0 returned -14
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=8224
sclass=netlink_route_socket
---
This bug is generated by a bot. It may contain errors.
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syzbot
Feb 2, 2020, 12:12:06 PM2/2/20
to syzkaller-a...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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