syzbot


general protection fault in hrtimer_nanosleep

Status: upstream: reported syz repro on 2023/11/01 05:36
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+b408cd9b40ec25380ee1@syzkaller.appspotmail.com
First crash: 211d, last: 139d
Cause bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ext4?] general protection fault in hrtimer_nanosleep 6 (7) 2023/11/10 17:08
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 KASAN: slab-out-of-bounds Read in hrtimer_nanosleep 1 823d 823d 0/1 auto-closed as invalid on 2022/06/22 20:59
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/03/22 13:05 25m retest repro upstream error OK
2023/11/11 07:48 22m retest repro upstream report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/01/07 08:33 2h07m bisect fix upstream job log (0) log
2023/12/08 05:16 3h15m bisect fix upstream job log (0) log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc003ffff113: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x00000001ffff8898-0x00000001ffff889f]
CPU: 1 PID: 5308 Comm: syz-executor.4 Not tainted 6.6.0-rc7-syzkaller-00142-g888cf78c29e2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:lookup_object lib/debugobjects.c:195 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:564 [inline]
RIP: 0010:__debug_object_init+0xf3/0x2b0 lib/debugobjects.c:634
Code: d8 48 c1 e8 03 42 80 3c 20 00 0f 85 85 01 00 00 48 8b 1b 48 85 db 0f 84 9f 00 00 00 48 8d 7b 18 83 c5 01 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 4c 01 00 00 4c 3b 73 18 75 c3 48 8d 7b 10 48
RSP: 0018:ffffc900050e7d08 EFLAGS: 00010012
RAX: 000000003ffff113 RBX: 00000001ffff8880 RCX: ffffffff8169123e
RDX: 1ffffffff249b149 RSI: 0000000000000004 RDI: 00000001ffff8898
RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000216
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff924d8a48 R14: ffffc900050e7d90 R15: ffffffff924d8a50
FS:  0000555556eec480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa23ab065ee CR3: 000000007e5c1000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 hrtimer_init_sleeper_on_stack kernel/time/hrtimer.c:447 [inline]
 hrtimer_nanosleep+0x122/0x440 kernel/time/hrtimer.c:2098
 common_nsleep+0xa1/0xc0 kernel/time/posix-timers.c:1350
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1396 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1373 [inline]
 __x64_sys_clock_nanosleep+0x344/0x490 kernel/time/posix-timers.c:1373
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff1a56a7ef5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 b9 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f ba ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffe80c6ee30 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007ff1a579bf80 RCX: 00007ff1a56a7ef5
RDX: 00007ffe80c6ee70 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ff1a579d980 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000fef3
R13: ffffffffffffffff R14: 00007ff1a5200000 R15: 000000000000fbb2
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:lookup_object lib/debugobjects.c:195 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:564 [inline]
RIP: 0010:__debug_object_init+0xf3/0x2b0 lib/debugobjects.c:634
Code: d8 48 c1 e8 03 42 80 3c 20 00 0f 85 85 01 00 00 48 8b 1b 48 85 db 0f 84 9f 00 00 00 48 8d 7b 18 83 c5 01 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 4c 01 00 00 4c 3b 73 18 75 c3 48 8d 7b 10 48
RSP: 0018:ffffc900050e7d08 EFLAGS: 00010012

RAX: 000000003ffff113 RBX: 00000001ffff8880 RCX: ffffffff8169123e
RDX: 1ffffffff249b149 RSI: 0000000000000004 RDI: 00000001ffff8898
RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000216
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff924d8a48 R14: ffffc900050e7d90 R15: ffffffff924d8a50
FS:  0000555556eec480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa23ab065ee CR3: 000000007e5c1000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
   0:	d8 48 c1             	fmuls  -0x3f(%rax)
   3:	e8 03 42 80 3c       	call   0x3c80420b
   8:	20 00                	and    %al,(%rax)
   a:	0f 85 85 01 00 00    	jne    0x195
  10:	48 8b 1b             	mov    (%rbx),%rbx
  13:	48 85 db             	test   %rbx,%rbx
  16:	0f 84 9f 00 00 00    	je     0xbb
  1c:	48 8d 7b 18          	lea    0x18(%rbx),%rdi
  20:	83 c5 01             	add    $0x1,%ebp
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	0f 85 4c 01 00 00    	jne    0x181
  35:	4c 3b 73 18          	cmp    0x18(%rbx),%r14
  39:	75 c3                	jne    0xfffffffe
  3b:	48 8d 7b 10          	lea    0x10(%rbx),%rdi
  3f:	48                   	rex.W

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/28 05:25 upstream 888cf78c29e2 3c418d72 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root general protection fault in hrtimer_nanosleep
* Struck through repros no longer work on HEAD.