WARNING: ODEBUG bug in tipc_subscrb_subscrp_delete

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: fbc5fe7a Linux 4.14.157
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16f20cdee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=253d29a660cb0d
dashboard link: https://syzkaller.appspot.com/bug?extid=16cf37a0745aa9905815
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+16cf37...@syzkaller.appspotmail.com

ODEBUG: assert_init not available (active state 0) object type: timer_list
hint: (null)
------------[ cut here ]------------
WARNING: CPU: 1 PID: 74 at lib/debugobjects.c:287
debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 74 Comm: kworker/u4:2 Not tainted 4.14.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: tipc_send tipc_send_work
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x142/0x197 lib/dump_stack.c:58
panic+0x1f9/0x42d kernel/panic.c:183
__warn.cold+0x2f/0x2f kernel/panic.c:547
report_bug+0x216/0x254 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:177 [inline]
fixup_bug arch/x86/kernel/traps.c:172 [inline]
do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287
RSP: 0018:ffff8880a994f9d8 EFLAGS: 00010286
RAX: 0000000000000061 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86cc2f80 RDI: ffffed1015329f31
RBP: ffff8880a994fa00 R08: 0000000000000061 R09: ffff8880a993ecf0
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff86cbe260
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88808677ef18
debug_object_assert_init lib/debugobjects.c:656 [inline]
debug_object_assert_init+0x22f/0x300 lib/debugobjects.c:627
debug_timer_assert_init kernel/time/timer.c:707 [inline]
debug_assert_init kernel/time/timer.c:755 [inline]
del_timer+0x67/0xf0 kernel/time/timer.c:1150
tipc_subscrb_subscrp_delete+0x16a/0x3b0 net/tipc/subscr.c:207
tipc_subscrb_delete net/tipc/subscr.c:238 [inline]
tipc_subscrb_release_cb+0x18/0x40 net/tipc/subscr.c:316
tipc_close_conn+0x176/0x230 net/tipc/server.c:203
tipc_send_to_sock net/tipc/server.c:538 [inline]
tipc_send_work+0x494/0x5c0 net/tipc/server.c:564
process_one_work+0x863/0x1600 kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: fbc5fe7a Linux 4.14.157
git tree: linux-4.14.y

console output: https://syzkaller.appspot.com/x/log.txt?x=16c8459ce00000

kernel config: https://syzkaller.appspot.com/x/.config?x=253d29a660cb0d
dashboard link: https://syzkaller.appspot.com/bug?extid=16cf37a0745aa9905815
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1582c282e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12852aeae00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+16cf37...@syzkaller.appspotmail.com

audit: type=1400 audit(1575497896.745:36): avc: denied { map } for
pid=6992 comm="syz-executor862" path="/root/syz-executor862971283"
dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1

ODEBUG: assert_init not available (active state 0) object type: timer_list

hint: 0xffff88809f962a30
------------[ cut here ]------------
WARNING: CPU: 0 PID: 22 at lib/debugobjects.c:287

debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 22 Comm: kworker/u4:1 Not tainted 4.14.157-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: tipc_send tipc_send_work
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x142/0x197 lib/dump_stack.c:58
panic+0x1f9/0x42d kernel/panic.c:183
__warn.cold+0x2f/0x2f kernel/panic.c:547
report_bug+0x216/0x254 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:177 [inline]
fixup_bug arch/x86/kernel/traps.c:172 [inline]
do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287

RSP: 0018:ffff8880a9ecf9d8 EFLAGS: 00010286
RAX: 0000000000000063 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86cc2f80 RDI: ffffed10153d9f31
RBP: ffff8880a9ecfa00 R08: 0000000000000063 R09: ffff8880a9ec4eb0

R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff86cbe260

R13: ffff88809f962a30 R14: 0000000000000000 R15: ffff88809f962a18