bisecting fixing commit since a844dc4c544291470aa69edbe2434b040794e269
building syzkaller on b31eda3df81f62eb7efde0c5d7a9f24ee7e34e6f
testing commit a844dc4c544291470aa69edbe2434b040794e269 with gcc (GCC) 8.1.0
kernel signature: 08e937f8ad58447549ab83e6c7076faea6f701c92f097e8b98bd12f3d7549f48
all runs: crashed: kernel BUG at kernel/time/timer.c:LINE!
testing current HEAD 9a95f25269bd9257ab9fba7bb14355d50b5f39ec
testing commit 9a95f25269bd9257ab9fba7bb14355d50b5f39ec with gcc (GCC) 8.1.0
kernel signature: c7837b9de3090485a3d8a8a00abea1c297ced856cfbd57ac4d54b99eb7d46151
all runs: crashed: kernel BUG at kernel/time/timer.c:LINE!
revisions tested: 2, total time: 28m27.050862172s (build: 16m54.233474443s, test: 10m26.159117758s)
the crash still happens on HEAD
commit msg: Linux 4.14.168
crash: kernel BUG at kernel/time/timer.c:LINE!
sp2: Synchronizing with TNC
sp2: Found TNC
sp4: Found TNC
sp3: 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: 0 PID: 7289 Comm: kworker/u4:6 Not tainted 4.14.168-syzkaller #0
6pack: bad checksum 32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
task: ffff888077ad6380 task.stack: ffff88807dd60000
RIP: 0010:add_timer+0x5ec/0xab0 kernel/time/timer.c:1089
RSP: 0018:ffff88807dd67b40 EFLAGS: 00010282
RAX: 1ffff11011c605d9 RBX: 1ffff1100fbacf6f RCX: 0000000000000028
RDX: dffffc0000000000 RSI: ffff888077ad6c78 RDI: ffff88808e302ec8
RBP: ffff88807dd67c00 R08: ffff888077ad6c98 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88808117cc74 R14: ffff88807dd67bd8 R15: ffff88808e302ec0
6pack: protocol violation
FS:  0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5db9959de CR3: 00000000a939a000 CR4: 00000000001406f0
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+0x8ed/0x1180 drivers/net/hamradio/6pack.c:458
6pack: protocol violation
 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:2114
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2248
 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 54 70 b3 7e 0f 85 e0 fd ff ff e8 8a c1 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 2d 70 
6pack: protocol violation
RIP: add_timer+0x5ec/0xab0 kernel/time/timer.c:1089 RSP: ffff88807dd67b40
6pack: protocol violation
sp1: Synchronizing with TNC
6pack: protocol violation
6pack: protocol violation
sp2: Synchronizing with TNC
6pack: protocol violation
sp3: Synchronizing with TNC
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
6pack: protocol violation
sp5: Synchronizing with TNC
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
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: 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 52
6pack: protocol violation
6pack: bad checksum 13
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
sp6: Synchronizing with TNC
6pack: bad checksum 13
6pack: bad checksum 19
6pack: bad checksum 13
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 52
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: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 19
6pack: bad checksum 52
sp7: Synchronizing with TNC
6pack: bad checksum 52
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 52
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 19
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 19
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
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum f6
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 94
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
sp8: Synchronizing with TNC
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
sp5: Found TNC
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: 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
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
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum f6
6pack: bad checksum 94
sp6: Found TNC
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: 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 f6
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 94
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 13
sp3: Found TNC
6pack: protocol violation
6pack: bad checksum f6
6pack: bad checksum 34
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 13
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 94
6pack: bad checksum 13
6pack: protocol violation
6pack: bad checksum 52
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 52
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
sp0: Found TNC
6pack: bad checksum 34
6pack: bad checksum 19
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum f6
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 94
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
sp2: Found TNC
6pack: protocol violation
6pack: bad checksum f6
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 94
6pack: protocol violation
6pack: bad checksum 34
6pack: protocol violation
sp1: Found TNC
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 32
6pack: protocol violation
6pack: protocol violation
6pack: bad checksum 32
6pack: protocol violation
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: 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
---[ end trace 8b6b6a6b311cc647 ]---
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
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation
6pack: protocol violation