possible deadlock in red_adaptative_timer

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3f2ecb86 Linux 4.14.212
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17c12f17500000
kernel config: https://syzkaller.appspot.com/x/.config?x=80549830ca6ffbb2
dashboard link: https://syzkaller.appspot.com/bug?extid=3612cf9819657cef64d0
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17320f03500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3612cf...@syzkaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
overlayfs: failed to resolve './file0': -2
======================================================
WARNING: possible circular locking dependency detected
4.14.212-syzkaller #0 Not tainted
------------------------------------------------------
modprobe/9492 is trying to acquire lock:
(&qdisc_rx_lock){+.-.}, at: [<ffffffff85f36772>] spin_lock include/linux/spinlock.h:317 [inline]
(&qdisc_rx_lock){+.-.}, at: [<ffffffff85f36772>] red_adaptative_timer+0x72/0x570 net/sched/sch_red.c:233

but task is already holding lock:
(((&q->adapt_timer))){+.-.}, at: [<ffffffff814a4568>] lockdep_copy_map include/linux/lockdep.h:174 [inline]
(((&q->adapt_timer))){+.-.}, at: [<ffffffff814a4568>] call_timer_fn+0xb8/0x650 kernel/time/timer.c:1270

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (((&q->adapt_timer))){+.-.}:
del_timer_sync+0xaf/0x240 kernel/time/timer.c:1236
red_destroy+0x15/0x50 net/sched/sch_red.c:154
qdisc_destroy+0x13c/0x310 net/sched/sch_generic.c:726
red_change+0x4a4/0xf80 net/sched/sch_red.c:205
qdisc_change net/sched/sch_api.c:1144 [inline]
tc_modify_qdisc+0xd4e/0x1250 net/sched/sch_api.c:1410
rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4316
netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433
netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313
netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xb5/0x100 net/socket.c:656
___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
__sys_sendmsg+0xa3/0x120 net/socket.c:2096
SYSC_sendmsg net/socket.c:2107 [inline]
SyS_sendmsg+0x27/0x40 net/socket.c:2103
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #0 (&qdisc_rx_lock){+.-.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
red_adaptative_timer+0x72/0x570 net/sched/sch_red.c:233
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
__run_timers kernel/time/timer.c:1637 [inline]
run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650
__do_softirq+0x254/0xa1d kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x193/0x240 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
change_protection_range+0x0/0x1630 mm/mprotect.c:348
change_protection mm/mprotect.c:324 [inline]
mprotect_fixup+0x600/0x8c0 mm/mprotect.c:451
setup_arg_pages+0x344/0x6f0 fs/exec.c:751
load_elf_binary+0xa01/0x4750 fs/binfmt_elf.c:873
search_binary_handler.part.0+0xd5/0x640 fs/exec.c:1653
search_binary_handler fs/exec.c:1642 [inline]
exec_binprm fs/exec.c:1695 [inline]
do_execveat_common+0x1099/0x1f30 fs/exec.c:1815
do_execve+0x33/0x50 fs/exec.c:1860
call_usermodehelper_exec_async+0x2ed/0x510 kernel/umh.c:109
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

other info that might help us debug this:

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(((&q->adapt_timer)));
lock(&qdisc_rx_lock);
lock(((&q->adapt_timer)));
lock(&qdisc_rx_lock);

*** DEADLOCK ***

2 locks held by modprobe/9492:
#0: (&mm->mmap_sem){++++}, at: [<ffffffff818a2ff2>] setup_arg_pages+0x242/0x6f0 fs/exec.c:734
#1: (((&q->adapt_timer))){+.-.}, at: [<ffffffff814a4568>] lockdep_copy_map include/linux/lockdep.h:174 [inline]
#1: (((&q->adapt_timer))){+.-.}, at: [<ffffffff814a4568>] call_timer_fn+0xb8/0x650 kernel/time/timer.c:1270

stack backtrace:
CPU: 1 PID: 9492 Comm: modprobe Not tainted 4.14.212-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
red_adaptative_timer+0x72/0x570 net/sched/sch_red.c:233
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
__run_timers kernel/time/timer.c:1637 [inline]
run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650
__do_softirq+0x254/0xa1d kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x193/0x240 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
</IRQ>
RIP: 0010:change_protection_range+0x0/0x1630 mm/mprotect.c:288
RSP: 0018:ffff88809c017a50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffff88809ac740c0 RBX: ffff8880a034def8 RCX: 8000000000000025
RDX: 00007ffffffff000 RSI: 00007fffffffe000 RDI: ffff8880a034deb0
RBP: ffff8880a034deb0 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88809ac74948 R11: ffff88809ac740c0 R12: 0000000000118173
R13: 00007fffffffe000 R14: ffff88809b766cc0 R15: ffff8880a034df00
change_protection mm/mprotect.c:324 [inline]
mprotect_fixup+0x600/0x8c0 mm/mprotect.c:451
setup_arg_pages+0x344/0x6f0 fs/exec.c:751
load_elf_binary+0xa01/0x4750 fs/binfmt_elf.c:873
search_binary_handler.part.0+0xd5/0x640 fs/exec.c:1653
search_binary_handler fs/exec.c:1642 [inline]
exec_binprm fs/exec.c:1695 [inline]
do_execveat_common+0x1099/0x1f30 fs/exec.c:1815
do_execve+0x33/0x50 fs/exec.c:1860
call_usermodehelper_exec_async+0x2ed/0x510 kernel/umh.c:109
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
overlayfs: failed to resolve './file0': -2
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---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 17529385 Linux 4.14.213
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=100e942b500000
kernel config: https://syzkaller.appspot.com/x/.config?x=f94010bb59bd4675

dashboard link: https://syzkaller.appspot.com/bug?extid=3612cf9819657cef64d0
compiler: gcc (GCC) 10.1.0-syz 20200507

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15333333500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159ff58f500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3612cf...@syzkaller.appspotmail.com

IPVS: ftp: loaded support on port[0] = 21

======================================================
WARNING: possible circular locking dependency detected

4.14.213-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:2/34 is trying to acquire lock:
(&qdisc_rx_lock){+.-.}, at: [<ffffffff85f37772>] spin_lock include/linux/spinlock.h:317 [inline]
(&qdisc_rx_lock){+.-.}, at: [<ffffffff85f37772>] red_adaptative_timer+0x72/0x570 net/sched/sch_red.c:233

but task is already holding lock:

(((&q->adapt_timer))){+.-.}, at: [<ffffffff814a45c8>] lockdep_copy_map include/linux/lockdep.h:174 [inline]
(((&q->adapt_timer))){+.-.}, at: [<ffffffff814a45c8>] call_timer_fn+0xb8/0x650 kernel/time/timer.c:1270

preempt_count_equals kernel/sched/core.c:5972 [inline]
___might_sleep+0x6c/0x2b0 kernel/sched/core.c:6005
inet_twsk_purge+0x9a/0x5a0 net/ipv4/inet_timewait_sock.c:268
ops_exit_list+0xf9/0x150 net/core/net_namespace.c:145
cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484
process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232

ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

other info that might help us debug this:

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(((&q->adapt_timer)));
lock(&qdisc_rx_lock);
lock(((&q->adapt_timer)));
lock(&qdisc_rx_lock);

*** DEADLOCK ***

4 locks held by kworker/u4:2/34:
#0: ("%s""netns"){+.+.}, at: [<ffffffff81373630>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
#1: (net_cleanup_work){+.+.}, at: [<ffffffff81373666>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
#2: (net_mutex){+.+.}, at: [<ffffffff85dc8bf0>] cleanup_net+0x110/0x840 net/core/net_namespace.c:450
#3: (((&q->adapt_timer))){+.-.}, at: [<ffffffff814a45c8>] lockdep_copy_map include/linux/lockdep.h:174 [inline]
#3: (((&q->adapt_timer))){+.-.}, at: [<ffffffff814a45c8>] call_timer_fn+0xb8/0x650 kernel/time/timer.c:1270

stack backtrace:
CPU: 0 PID: 34 Comm: kworker/u4:2 Not tainted 4.14.213-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

Workqueue: netns cleanup_net

RIP: 0010:preempt_count_equals kernel/sched/core.c:5972 [inline]
RIP: 0010:___might_sleep+0x6c/0x2b0 kernel/sched/core.c:6005
RSP: 0018:ffff8880b56c7bc8 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 1ffff11016ad70a8 RSI: 00000000ffffffff RDI: ffff8880b56b8540
RBP: ffffffff885c9540 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000000000 R11: ffff8880b56b81c0 R12: 000000000000010c
R13: 0000000000000000 R14: ffff8880b56b81c0 R15: dffffc0000000000
inet_twsk_purge+0x9a/0x5a0 net/ipv4/inet_timewait_sock.c:268
ops_exit_list+0xf9/0x150 net/core/net_namespace.c:145
cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484
process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 43c9bffda3a21f363c0beab06f24c1974e1d4b9f
Author: Eric Dumazet <edum...@google.com>
Date: Wed Mar 10 16:26:41 2021 +0000

net: sched: validate stab values

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=102f8139d00000
start commit: 17529385 Linux 4.14.213
git tree: linux-4.14.y

kernel config: https://syzkaller.appspot.com/x/.config?x=f94010bb59bd4675
dashboard link: https://syzkaller.appspot.com/bug?extid=3612cf9819657cef64d0

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15333333500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159ff58f500000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: net: sched: validate stab values

For information about bisection process see: https://goo.gl/tpsmEJ#bisection