INFO: task hung in tls_sw_free_resources_tx

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: e40a826a6cbc qed: Add support for virtual link.
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1539e7c9400000
kernel config: https://syzkaller.appspot.com/x/.config?x=7e7e2279c0020d5f
dashboard link: https://syzkaller.appspot.com/bug?extid=6951742f48940cac9878
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [avi...@mellanox.com bor...@mellanox.com
davej...@fb.com da...@davemloft.net linux-...@vger.kernel.org
net...@vger.kernel.org]

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+695174...@syzkaller.appspotmail.com

x_tables: eb_tables: realm match: used from hooks OUTPUT, but only valid
from INPUT/FORWARD/OUTPUT/POSTROUTING
x_tables: eb_tables: realm match: used from hooks OUTPUT, but only valid
from INPUT/FORWARD/OUTPUT/POSTROUTING
INFO: task syz-executor3:9042 blocked for more than 140 seconds.
Not tainted 4.19.0-rc6+ #254
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D23824 9042 5871 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136
crypto_wait_req include/linux/crypto.h:517 [inline]
tls_sw_free_resources_tx+0x528/0xd20 net/tls/tls_sw.c:1596
tls_sk_proto_close+0x605/0x750 net/tls/tls_main.c:278
inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1141
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410ff1
Code: 8b 44 24 10 48 8b 4c 24 08 48 89 0c 24 89 44 24 08 48 8b 44 24 30 48
89 44 24 10 e8 b9 21 00 00 48 8b 44 24 30 48 89 44 24 58 <48> 8b 6c 24 38
48 83 c4 40 c3 48 8d 05 5c ee 48 00 48 89 04 24 48
RSP: 002b:00007fffe1b80850 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000410ff1
RDX: 0000001b32020000 RSI: 0000000000731210 RDI: 0000000000000003
RBP: 0000000000000000 R08: ffffffff8138591a R09: 000000001645fada
R10: 00007fffe1b80780 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000027 R15: 0000000000000003
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 943 Comm: khungtaskd Not tainted 4.19.0-rc6+ #254
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
watchdog+0xb3e/0x1050 kernel/hung_task.c:265
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10
arch/x86/include/asm/irqflags.h:57


---
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#bug-status-tracking for how to communicate with
syzbot.

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: 6915bf3b002b net: phy: don't allow __set_phy_supported to ..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=177085a3400000
kernel config: https://syzkaller.appspot.com/x/.config?x=28ecefa8a6e10719

dashboard link: https://syzkaller.appspot.com/bug?extid=6951742f48940cac9878
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11e6996d400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=117e2125400000
CC: [avi...@mellanox.com bor...@mellanox.com
dan...@iogearbox.net davej...@fb.com da...@davemloft.net
john.fa...@gmail.com linux-...@vger.kernel.org
net...@vger.kernel.org]

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+695174...@syzkaller.appspotmail.com

TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
cookies. Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
cookies. Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
cookies. Check SNMP counters.
INFO: task syz-executor852:6003 blocked for more than 140 seconds.
Not tainted 4.20.0-rc4+ #324

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

syz-executor852 D20984 6003 5985 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
schedule+0xfe/0x460 kernel/sched/core.c:3516

schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136

crypto_wait_req include/linux/crypto.h:583 [inline]
tls_sw_free_resources_tx+0x52b/0xcf0 net/tls/tls_sw.c:1774
tls_sk_proto_close+0x602/0x750 net/tls/tls_main.c:278

inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1141
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113

tracehook_notify_resume include/linux/tracehook.h:188 [inline]

exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

RIP: 0033:0x400fe0
Code: 01 f0 ff ff 0f 83 b0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
44 00 00 83 3d ed 16 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 0f 83 84 0a 00 00 c3 48 83 ec 08 e8 3a 01 00 00
RSP: 002b:00007ffe30095a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400fe0
RDX: 0000000000000058 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000067edd
R13: 0000000000401f80 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
1 lock held by khungtaskd/1020:
#0: 0000000034ca4b1e (rcu_read_lock){....}, at:
debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379
1 lock held by rsyslogd/5866:
#0: 00000000f2b3f94d (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200
fs/file.c:766
2 locks held by getty/5956:
#0: 000000000ac99831 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000d09933e4 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5957:
#0: 000000005f0193c3 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000f88a15c8 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5958:
#0: 00000000794f4a79 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000002fefcb05 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5959:
#0: 0000000074eb97d6 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 0000000065ce552e (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5960:
#0: 00000000c84b7e95 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 0000000020f1a59d (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5961:
#0: 00000000c90dcbd8 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000409d1c2e (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/5962:
#0: 000000006f39f77f (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000c23bd515 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by syz-executor852/6003:
#0: 000000005aa3007c (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock
include/linux/fs.h:757 [inline]
#0: 000000005aa3007c (&sb->s_type->i_mutex_key#11){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
#1: 0000000097a7edc0 (sk_lock-AF_INET6){+.+.}, at: lock_sock
include/net/sock.h:1492 [inline]
#1: 0000000097a7edc0 (sk_lock-AF_INET6){+.+.}, at:
tls_sk_proto_close+0xf5/0x750 net/tls/tls_main.c:262

=============================================

NMI backtrace for cpu 0

CPU: 0 PID: 1020 Comm: khungtaskd Not tainted 4.20.0-rc4+ #324

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]

dump_stack+0x244/0x39d lib/dump_stack.c:113
nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
watchdog+0xb51/0x1060 kernel/hung_task.c:289
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10
arch/x86/include/asm/irqflags.h:57

[Dmitry Vyukov]

#syz upstream

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