bisecting fixing commit since a844dc4c544291470aa69edbe2434b040794e269
building syzkaller on b31eda3df81f62eb7efde0c5d7a9f24ee7e34e6f
testing commit a844dc4c544291470aa69edbe2434b040794e269 with gcc (GCC) 8.1.0
kernel signature: 8b6ce9e8ccf02ffea84dd1b14591d40f5ca55e0e1433c5ae0c4649d06956eb4f
all runs: crashed: kernel BUG at kernel/time/timer.c:LINE!
testing current HEAD a41ba30d9df20fe141c92aacbb56b6b077f19716
testing commit a41ba30d9df20fe141c92aacbb56b6b077f19716 with gcc (GCC) 8.1.0
kernel signature: 0fb6cc764182db065d35634bb5d13bea0ee79b6805c1cc98f2bfa2adbfcc12f2
all runs: crashed: kernel BUG at kernel/time/timer.c:LINE!
revisions tested: 2, total time: 24m22.027217382s (build: 17m11.685969723s, test: 6m17.577650831s)
the crash still happens on HEAD
commit msg: Linux 4.14.181
crash: kernel BUG at kernel/time/timer.c:LINE!
sp0: Found TNC
sp1: Synchronizing with TNC
sp3: Found TNC
sp1: Found TNC
------------[ cut here ]------------
kernel BUG at kernel/time/timer.c:1089!
sp0: Synchronizing with TNC
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2793 Comm: kworker/u4:4 Not tainted 4.14.181-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
task: ffff88809ef00580 task.stack: ffff88809ef08000
RIP: 0010:add_timer+0x5ec/0xab0 kernel/time/timer.c:1089
RSP: 0018:ffff88809ef0fb40 EFLAGS: 00010286
RAX: 1ffff110115139f9 RBX: 1ffff11013de1f6f RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffff88809ef00e80 RDI: ffff88808a89cfc8
RBP: ffff88809ef0fc00 R08: ffff88809ef00ea0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a968d348 R14: ffff88809ef0fbd8 R15: ffff88808a89cfc0
FS:  0000000000000000(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc7fe5f1028 CR3: 0000000096550000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 decode_prio_command drivers/net/hamradio/6pack.c:934 [inline]
 sixpack_decode drivers/net/hamradio/6pack.c:1003 [inline]
 sixpack_receive_buf+0x8ee/0x1180 drivers/net/hamradio/6pack.c:458
 tty_ldisc_receive_buf+0xff/0x1b0 drivers/tty/tty_buffer.c:459
 tty_port_default_receive_buf+0x5f/0x90 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:475 [inline]
 flush_to_ldisc+0x197/0x390 drivers/tty/tty_buffer.c:527
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 8b a5 58 ff ff ff 48 8b 9d 50 ff ff ff 4c 8b ad 48 ff ff ff 65 ff 0d 14 4e b3 7e 0f 85 e0 fd ff ff e8 4a 9f b1 ff e9 d6 fd ff ff <0f> 0b 0f 0b 4c 89 a5 68 ff ff ff e9 b2 fd ff ff 65 ff 05 ed 4d 
RIP: add_timer+0x5ec/0xab0 kernel/time/timer.c:1089 RSP: ffff88809ef0fb40
6pack: bad checksum 32
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 13
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 52
6pack: protocol violation
6pack: bad checksum 19
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
sp2: Synchronizing with TNC
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum f6
6pack: protocol violation
6pack: bad checksum 94
6pack: protocol violation
sp0: Found TNC
6pack: protocol violation
6pack: bad checksum 34
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 13
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 13
6pack: bad checksum 52
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 19
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
sp3: Synchronizing with TNC
6pack: bad checksum 32
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
---[ end trace 8e3827b6e7a7e17c ]---
6pack: protocol violation
6pack: protocol violation
sp3: Synchronizing with TNC
sp4: Synchronizing with TNC