syzbot


general protection fault in blk_stat_add

Status: auto-obsoleted due to no activity on 2024/01/09 18:18
Subsystems: block hfs
[Documentation on labels]
Reported-by: syzbot+a6eebfd633f0f4630a40@syzkaller.appspotmail.com
First crash: 203d, last: 203d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: general protection fault in kernfs_fop_open (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [block?] [hfs?] general protection fault in blk_stat_add 0 (1) 2023/08/16 02:17
Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/01/09 06:07 22m retest repro linux-next OK log
2024/01/09 05:43 23m retest repro linux-next OK log
2023/10/31 05:11 24m retest repro linux-next report log
2023/08/22 04:41 17m retest repro linux-next report log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 PID: 22 Comm: ksoftirqd/1 Not tainted 6.5.0-rc5-next-20230809-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:hlist_unhashed_lockless include/linux/list.h:963 [inline]
RIP: 0010:timer_pending include/linux/timer.h:168 [inline]
RIP: 0010:blk_stat_is_active block/blk-stat.h:133 [inline]
RIP: 0010:blk_stat_add+0x168/0x4f0 block/blk-stat.c:66
Code: 48 bd 00 00 00 00 00 fc ff df 4d 63 f6 4a 8d 04 f5 00 8a 3b 8c 48 89 44 24 08 e8 73 09 7f fd 48 8d 7b 18 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 ca 02 00 00 48 8b 43 18 48 85 c0 0f 84 0d 01 00
RSP: 0018:ffffc900001c7d10 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff888017643b80 RSI: ffffffff8408be0d RDI: 0000000000000018
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000022000
R13: 00000000000195cc R14: 0000000000000001 R15: ffff88801c78d690
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555562206f8 CR3: 000000001be4a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __blk_mq_end_request_acct block/blk-mq.c:1013 [inline]
 __blk_mq_end_request block/blk-mq.c:1022 [inline]
 blk_mq_end_request+0x2fd/0x3c0 block/blk-mq.c:1038
 lo_complete_rq+0x1c4/0x270 drivers/block/loop.c:370
 blk_complete_reqs+0xb2/0xf0 block/blk-mq.c:1114
 __do_softirq+0x218/0x965 kernel/softirq.c:553
 run_ksoftirqd kernel/softirq.c:921 [inline]
 run_ksoftirqd+0x31/0x60 kernel/softirq.c:913
 smpboot_thread_fn+0x67d/0xa00 kernel/smpboot.c:164
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hlist_unhashed_lockless include/linux/list.h:963 [inline]
RIP: 0010:timer_pending include/linux/timer.h:168 [inline]
RIP: 0010:blk_stat_is_active block/blk-stat.h:133 [inline]
RIP: 0010:blk_stat_add+0x168/0x4f0 block/blk-stat.c:66
Code: 48 bd 00 00 00 00 00 fc ff df 4d 63 f6 4a 8d 04 f5 00 8a 3b 8c 48 89 44 24 08 e8 73 09 7f fd 48 8d 7b 18 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 ca 02 00 00 48 8b 43 18 48 85 c0 0f 84 0d 01 00
RSP: 0018:ffffc900001c7d10 EFLAGS: 00010206

RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff888017643b80 RSI: ffffffff8408be0d RDI: 0000000000000018
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000022000
R13: 00000000000195cc R14: 0000000000000001 R15: ffff88801c78d690
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555562206f8 CR3: 000000001be4a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbp
   7:	fc ff df
   a:	4d 63 f6             	movslq %r14d,%r14
   d:	4a 8d 04 f5 00 8a 3b 	lea    -0x73c47600(,%r14,8),%rax
  14:	8c
  15:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  1a:	e8 73 09 7f fd       	call   0xfd7f0992
  1f:	48 8d 7b 18          	lea    0x18(%rbx),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	0f 85 ca 02 00 00    	jne    0x2fe
  34:	48 8b 43 18          	mov    0x18(%rbx),%rax
  38:	48 85 c0             	test   %rax,%rax
  3b:	0f                   	.byte 0xf
  3c:	84                   	.byte 0x84
  3d:	0d                   	.byte 0xd
  3e:	01 00                	add    %eax,(%rax)

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/12 02:14 linux-next 21ef7b1e17d0 39990d51 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root general protection fault in blk_stat_add
* Struck through repros no longer work on HEAD.