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general protection fault in update_sit_entry

Status: upstream: reported C repro on 2024/12/08 18:16
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+5befe124e5915c6e2b0f@syzkaller.appspotmail.com
First crash: 561d, last: 15h25m
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/12/09 android14-6.1 (ToT) c276c53965a8 C [report] general protection fault in update_sit_entry
2024/12/09 lts (merge base) 0d968ced7330 C Didn't crash
2024/12/09 upstream (ToT) fac04efc5c79 C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 general protection fault in update_sit_entry origin:lts-only 8 C error 18 11d 619d 0/3 upstream: reported C repro on 2024/10/11 17:04
linux-4.14 general protection fault in update_sit_entry f2fs 2 C 9 1206d 1319d 0/1 upstream: reported C repro on 2022/11/12 02:17
android-5-10 general protection fault in update_sit_entry 2 C 55 41m 570d 0/2 upstream: reported C repro on 2024/11/29 11:40
linux-6.1 general protection fault in update_sit_entry origin:lts-only 8 C done 17 151d 532d 0/3 upstream: reported C repro on 2025/01/07 01:40
android-5-15 general protection fault in update_sit_entry origin:downstream 2 C 67 11d 576d 0/2 upstream: reported C repro on 2024/11/24 02:28
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/05/10 16:50 19m retest repro android14-6.1 report log
2026/05/10 16:50 15m retest repro android14-6.1 report log
2026/05/10 16:50 15m retest repro android14-6.1 report log
2026/05/10 16:50 16m retest repro android14-6.1 report log
2026/05/10 16:50 19m retest repro android14-6.1 report log
2026/04/01 19:31 6m retest repro android14-6.1 report log
2026/04/01 19:31 7m retest repro android14-6.1 report log
2026/04/01 19:31 13m retest repro android14-6.1 report log
2026/04/01 19:31 13m retest repro android14-6.1 report log
2026/03/13 19:42 7m retest repro android14-6.1 error
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2026/03/29 11:24 0m bisect fix android14-6.1 error job log
2025/04/25 04:32 2h46m bisect fix android14-6.1 OK (0) job log log
2025/03/05 01:17 1h12m bisect fix android14-6.1 OK (0) job log log
2025/01/31 09:30 1h20m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
F2FS-fs (loop5): f2fs_disable_checkpoint() finish, err:0
F2FS-fs (loop5): Mounted with checkpoint version = 48b305e6
general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 PID: 669 Comm: syz.5.72 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:3004 [inline]
RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2399 [inline]
RIP: 0010:update_sit_entry+0x508/0x15c0 fs/f2fs/segment.c:2443
Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 df 95 8a ff 48 8b 1b 4c 01 f3 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 6d 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8
RSP: 0018:ffffc900013af140 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 000000000000003b RCX: dffffc0000000000
RDX: ffff888118270000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900013af210 R08: ffff888118270000 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881138ec0d8 R14: 000000000000003b R15: 0000000000000020
FS:  00007f1fcbb3c6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1fcbb1bd58 CR3: 000000011d4b6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f2fs_allocate_data_block+0x14ca/0x3b30 fs/f2fs/segment.c:3434
 __allocate_data_block fs/f2fs/data.c:1498 [inline]
 f2fs_map_blocks+0x17c7/0x3d50 fs/f2fs/data.c:1690
 f2fs_expand_inode_data+0x631/0xa60 fs/f2fs/file.c:1860
 f2fs_fallocate+0x3cf/0x730 fs/f2fs/file.c:1961
 vfs_fallocate+0x4c5/0x5a0 fs/open.c:324
 ioctl_preallocate fs/ioctl.c:290 [inline]
 file_ioctl fs/ioctl.c:330 [inline]
 do_vfs_ioctl+0x194b/0x1cd0 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x9f/0x1b0 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1fcab9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1fcbb3c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1fcae15fa0 RCX: 00007f1fcab9ce59
RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 00007f1fcac32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1fcae16038 R14: 00007f1fcae15fa0 R15: 00007ffd4d3a18e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:3004 [inline]
RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2399 [inline]
RIP: 0010:update_sit_entry+0x508/0x15c0 fs/f2fs/segment.c:2443
Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 df 95 8a ff 48 8b 1b 4c 01 f3 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 6d 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8
RSP: 0018:ffffc900013af140 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 000000000000003b RCX: dffffc0000000000
RDX: ffff888118270000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900013af210 R08: ffff888118270000 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881138ec0d8 R14: 000000000000003b R15: 0000000000000020
FS:  00007f1fcbb3c6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fef5d544000 CR3: 000000011d4b6000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	fc                   	cld
   3:	ff                   	lcall  (bad)
   4:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   a:	08 48 89             	or     %cl,-0x77(%rax)
   d:	df e8                	fucomip %st(0),%st
   f:	df 95 8a ff 48 8b    	fists  -0x74b70076(%rbp)
  15:	1b 4c 01 f3          	sbb    -0xd(%rcx,%rax,1),%ecx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 6d 0f 00 00    	jne    0xfa3
  36:	44 0f b6 23          	movzbl (%rbx),%r12d
  3a:	44 89 e0             	mov    %r12d,%eax
  3d:	44 08 f8             	or     %r15b,%al

Crashes (36):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/22 19:25 android14-6.1 b07bd8273426 5f091fcc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2026/01/06 05:49 android14-6.1 5e6db7045704 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/12/25 03:16 android14-6.1 6da82810f8a5 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/12/07 15:31 android14-6.1 5ddae867b428 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/11/29 18:21 android14-6.1 a92da54b7708 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/22 10:16 android14-6.1 f6c21bc9a693 d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/22 09:39 android14-6.1 f6c21bc9a693 d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/22 06:24 android14-6.1 f6c21bc9a693 d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/15 02:08 android14-6.1 6246d345f550 5f4b362d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/13 05:55 android14-6.1 74db64dcc8aa 98683f8f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/10 22:37 android14-6.1 13ff1300ee84 5d7e17ca .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/10 14:14 android14-6.1 13ff1300ee84 4826c28e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/10 11:19 android14-6.1 13ff1300ee84 4826c28e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2025/05/26 07:00 android14-6.1 3c6d0251e1fb 2d4582d0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2024/12/08 19:26 android14-6.1 c276c53965a8 9ac0fdc6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 general protection fault in update_sit_entry
2024/12/08 18:51 android14-6.1 c276c53965a8 9ac0fdc6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 general protection fault in update_sit_entry
2024/12/08 18:12 android14-6.1 c276c53965a8 9ac0fdc6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 general protection fault in update_sit_entry
2026/02/27 11:19 android14-6.1 6bfa51973214 a2f13f71 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in update_sit_entry
2026/06/22 16:19 android14-6.1 72813af230c7 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/06/22 10:32 android14-6.1 72813af230c7 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/06/21 06:19 android14-6.1 72813af230c7 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/05/31 22:59 android14-6.1 b28955bde980 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/04/22 16:28 android14-6.1 15ea42c3d32a 4595e353 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/04/11 07:40 android14-6.1 4a2a41bddacb 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/01/25 23:50 android14-6.1 5b3c238664a9 55756628 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/01/25 23:50 android14-6.1 5b3c238664a9 55756628 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/01/25 23:50 android14-6.1 5b3c238664a9 55756628 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/01/25 23:49 android14-6.1 5b3c238664a9 55756628 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2026/01/06 13:07 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2025/12/31 08:33 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2025/11/29 17:22 android14-6.1 a92da54b7708 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2025/06/20 05:49 android14-6.1 f6c21bc9a693 ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2024/12/28 19:34 android14-6.1 3f924195e222 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2024/12/28 19:33 android14-6.1 3f924195e222 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2024/12/08 22:06 android14-6.1 c276c53965a8 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
2024/12/08 17:38 android14-6.1 c276c53965a8 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in update_sit_entry
* Struck through repros no longer work on HEAD.