ci starts bisection 2023-04-27 22:41:24.346849606 +0000 UTC m=+9627.486745759
bisecting fixing commit since 3a93e40326c8f470e71d20b4c42d36767450f38f
building syzkaller on 48c747718b6ee9425b846941d81e7f6dfe050859
ensuring issue is reproducible on original commit 3a93e40326c8f470e71d20b4c42d36767450f38f

testing commit 3a93e40326c8f470e71d20b4c42d36767450f38f gcc
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 8ad9ec7c6ee11e3bbd2b49730c7bb042956dea16a84dfd1c1270405c656e33c4
all runs: crashed: divide error in do_journal_end
testing current HEAD cec24b8b6bb841a19b5c5555b600a511a8988100
testing commit cec24b8b6bb841a19b5c5555b600a511a8988100 gcc
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 2ec58b6b329f0ea426209e5830eae2957b3a630a65f7214c86f6e22d0a668223
all runs: crashed: divide error in do_journal_end
revisions tested: 2, total time: 33m48.223144152s (build: 26m14.045338982s, test: 6m52.871756502s)
the crash still happens on HEAD
commit msg: Merge tag 'char-misc-6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
crash: divide error in do_journal_end
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5334 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:do_journal_end+0x1469/0x4ad0 fs/reiserfs/journal.c:4089
Code: c6 41 84 f0 0f 85 06 34 00 00 83 e2 07 38 d1 40 0f 9e c6 84 c9 0f 95 c2 40 84 d6 0f 85 ef 33 00 00 8b 4b 14 48 8d 7d 18 31 d2 <48> f7 f1 4a 8d 34 2a 48 89 fa 48 b8 00 00 00 00 00 fc ff df 48 c1
RSP: 0018:ffffc90004fcfb18 EFLAGS: 00010246
RAX: 0000000000000003 RBX: ffff88806e428000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888076145018
RBP: ffff888076145000 R08: 0000000000000001 R09: 424c724573496552
R10: ffff888075751000 R11: 0000000000000004 R12: 0000000000001000
R13: 0000000000000000 R14: ffffc90004fcfd08 R15: ffffc90005251050
FS:  0000555556a6f400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558411a99950 CR3: 000000002715b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 reiserfs_sync_fs+0xd9/0xf0 fs/reiserfs/super.c:78
 sync_filesystem.part.0+0x63/0x170 fs/sync.c:56
 generic_shutdown_super+0x68/0x420 fs/super.c:473
 kill_block_super+0x9a/0xe0 fs/super.c:1407
 deactivate_locked_super+0x7f/0x130 fs/super.c:331
 cleanup_mnt+0x253/0x360 fs/namespace.c:1177
 task_work_run+0x12f/0x220 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff4a508d567
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe8c2d6748 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff4a508d567
RDX: 00007ffe8c2d6819 RSI: 000000000000000a RDI: 00007ffe8c2d6810
RBP: 00007ffe8c2d6810 R08: 00000000ffffffff R09: 00007ffe8c2d65e0
R10: 0000555556a70893 R11: 0000000000000246 R12: 00007ff4a50e6b74
R13: 00007ffe8c2d78d0 R14: 0000555556a70810 R15: 00007ffe8c2d7910
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:do_journal_end+0x1469/0x4ad0 fs/reiserfs/journal.c:4089
Code: c6 41 84 f0 0f 85 06 34 00 00 83 e2 07 38 d1 40 0f 9e c6 84 c9 0f 95 c2 40 84 d6 0f 85 ef 33 00 00 8b 4b 14 48 8d 7d 18 31 d2 <48> f7 f1 4a 8d 34 2a 48 89 fa 48 b8 00 00 00 00 00 fc ff df 48 c1
RSP: 0018:ffffc90004fcfb18 EFLAGS: 00010246
RAX: 0000000000000003 RBX: ffff88806e428000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888076145018
RBP: ffff888076145000 R08: 0000000000000001 R09: 424c724573496552
R10: ffff888075751000 R11: 0000000000000004 R12: 0000000000001000
R13: 0000000000000000 R14: ffffc90004fcfd08 R15: ffffc90005251050
FS:  0000555556a6f400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b06fc26950 CR3: 000000002715b000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
   0:	c6 41 84 f0          	movb   $0xf0,-0x7c(%rcx)
   4:	0f 85 06 34 00 00    	jne    0x3410
   a:	83 e2 07             	and    $0x7,%edx
   d:	38 d1                	cmp    %dl,%cl
   f:	40 0f 9e c6          	setle  %sil
  13:	84 c9                	test   %cl,%cl
  15:	0f 95 c2             	setne  %dl
  18:	40 84 d6             	test   %dl,%sil
  1b:	0f 85 ef 33 00 00    	jne    0x3410
  21:	8b 4b 14             	mov    0x14(%rbx),%ecx
  24:	48 8d 7d 18          	lea    0x18(%rbp),%rdi
  28:	31 d2                	xor    %edx,%edx
* 2a:	48 f7 f1             	div    %rcx <-- trapping instruction
  2d:	4a 8d 34 2a          	lea    (%rdx,%r13,1),%rsi
  31:	48 89 fa             	mov    %rdi,%rdx
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	48                   	rex.W
  3f:	c1                   	.byte 0xc1