INFO: trying to register non-static key in del_timer_sync

[syzbot]

Hello,

syzbot hit the following crash on upstream commit
c4e0ca7fa24137e372d6135fe16e8df8e123f116 (Fri Jan 26 23:10:50 2018 +0000)
Merge tag 'riscv-for-linus-4.15-maintainers' of
git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux

So far this crash happened 3 times on net-next, upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

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Reported-by: syzbot+3659f0...@syzkaller.appspotmail.com
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audit: type=1400 audit(1517074079.617:7): avc: denied { map } for
pid=3685 comm="syzkaller985951" path="/root/syzkaller985951088" dev="sda1"
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 3685 Comm: syzkaller985951 Not tainted 4.15.0-rc9+ #283
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
register_lock_class+0x542/0x2cd0 kernel/locking/lockdep.c:752
__lock_acquire+0x1de/0x3e00 kernel/locking/lockdep.c:3314
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914
del_timer_sync+0xba/0x240 kernel/time/timer.c:1275
led_tg_destroy+0x2dd/0x3f0 net/netfilter/xt_LED.c:185
cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:659
__do_replace+0x7d7/0xa90 net/ipv4/netfilter/ip_tables.c:1096
do_replace net/ipv4/netfilter/ip_tables.c:1152 [inline]
do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1682
nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256
tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2875
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
SYSC_setsockopt net/socket.c:1831 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1810
entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x4449fa
RSP: 002b:00007ffee653a948 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000006cd0fc RCX: 00000000004449fa
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006cd0fc R08: 00000000000002d8 R09: 000000000117c880
R10: 00000000006cd528 R11: 0000000000000206 R12: 0000000000000003
R13: 00000000006d00a4 R14: 00000000006d0050 R15: 00000000004a39ae
------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list
hint: (null)
WARNING: CPU: 1 PID: 3685 at lib/debugobjects.c:291
debug_print_object+0x166/0x220 lib/debugobjects.c:288
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3685 Comm: syzkaller985951 Not tainted 4.15.0-rc9+ #283
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
panic+0x1e4/0x41c kernel/panic.c:183
__warn+0x1dc/0x200 kernel/panic.c:547
report_bug+0x211/0x2d0 lib/bug.c:184
fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
fixup_bug arch/x86/kernel/traps.c:247 [inline]
do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1096
RIP: 0010:debug_print_object+0x166/0x220 lib/debugobjects.c:288
RSP: 0018:ffff8801d9adf7d0 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: 0000000000000005 RCX: ffffffff8159ebae
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000293
RBP: ffff8801d9adf810 R08: 0000000000000000 R09: 1ffff1003b35be97
R10: ffff8801d9adf6d0 R11: ffffffff86b38678 R12: 0000000000000001
R13: ffffffff86b49d00 R14: ffffffff86010440 R15: ffffffff815f1530
debug_object_assert_init+0x303/0x570 lib/debugobjects.c:654
debug_timer_assert_init kernel/time/timer.c:707 [inline]
debug_assert_init kernel/time/timer.c:759 [inline]
try_to_del_timer_sync+0x74/0x130 kernel/time/timer.c:1215
del_timer_sync+0x18a/0x240 kernel/time/timer.c:1285
led_tg_destroy+0x2dd/0x3f0 net/netfilter/xt_LED.c:185
cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:659
__do_replace+0x7d7/0xa90 net/ipv4/netfilter/ip_tables.c:1096
do_replace net/ipv4/netfilter/ip_tables.c:1152 [inline]
do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1682
nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256
tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2875
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
SYSC_setsockopt net/socket.c:1831 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1810
entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x4449fa
RSP: 002b:00007ffee653a948 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000006cd0fc RCX: 00000000004449fa
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006cd0fc R08: 00000000000002d8 R09: 000000000117c880
R10: 00000000006cd528 R11: 0000000000000206 R12: 0000000000000003
R13: 00000000006d00a4 R14: 00000000006d0050 R15: 00000000004a39ae
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[Eric Biggers]

This was fixed by commit 10414014bc085a:

#syz fix: netfilter: x_tables: fix missing timer initialization in xt_LED

- Eric