F2FS-fs (loop2): invalid crc value
F2FS-fs (loop2): Found nat_bits in checkpoint
F2FS-fs (loop2): recover fsync data on readonly fs
F2FS-fs (loop2): Mounted with checkpoint version = 48b305e4
==================================================================
BUG: KASAN: null-ptr-deref in f2fs_issue_flush+0x161/0x8b0 fs/f2fs/segment.c:-1
Write of size 4 at addr 0000000000000024 by task syz.2.17/369
CPU: 0 PID: 369 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:77
dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
__kasan_report mm/kasan/report.c:439 [inline]
kasan_report+0xd8/0x130 mm/kasan/report.c:452
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
f2fs_issue_flush+0x161/0x8b0 fs/f2fs/segment.c:-1
f2fs_do_sync_file+0x1325/0x1d80 fs/f2fs/file.c:385
f2fs_sync_file+0x103/0x150 fs/f2fs/file.c:401
vfs_fsync_range+0x190/0x1a0 fs/sync.c:202
generic_write_sync include/linux/fs.h:2920 [inline]
f2fs_file_write_iter+0x6d9/0x27a0 fs/f2fs/file.c:4933
call_write_iter include/linux/fs.h:2066 [inline]
new_sync_write fs/read_write.c:518 [inline]
vfs_write+0x758/0xdc0 fs/read_write.c:605
ksys_write+0x149/0x250 fs/read_write.c:658
__do_sys_write fs/read_write.c:670 [inline]
__se_sys_write fs/read_write.c:667 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:667
do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9d53b71e59
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:00007ffcbc3e4cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9d53deafa0 RCX: 00007f9d53b71e59
RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f9d53c07d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9d53deafac R14: 00007f9d53deafa0 R15: 00007f9d53deafa0
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000024
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 10f9a8067 P4D 10f9a8067 PUD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 369 Comm: syz.2.17 Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:arch_atomic_inc fs/f2fs/segment.c:-1 [inline]
RIP: 0010:atomic_inc include/asm-generic/atomic-instrumented.h:241 [inline]
RIP: 0010:f2fs_issue_flush+0x172/0x8b0 fs/f2fs/segment.c:678
Code: 44 58 ff 4c 89 64 24 28 49 83 c4 24 4c 89 e7 be 04 00 00 00 e8 ef c4 92 ff 81 e3 00 04 00 00 0f 85 52 01 00 00 4c 89 64 24 08 <f0> 41 ff 04 24 4c 8b 74 24 20 4d 8d ae 6c 0c 00 00 4d 89 ec 49 c1
RSP: 0018:ffffc90000c37580 EFLAGS: 00010246
RAX: ffff88810c5aa700 RBX: 0000000000000000 RCX: 0000000000000286
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000ffffffff
RBP: ffffc90000c37690 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0dcfa48 R12: 0000000000000024
R13: ffffc90000c375e0 R14: 0000000000000000 R15: 1ffff92000186eb8
FS: 0000555570521500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000024 CR3: 0000000110146000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
f2fs_do_sync_file+0x1325/0x1d80 fs/f2fs/file.c:385
f2fs_sync_file+0x103/0x150 fs/f2fs/file.c:401
vfs_fsync_range+0x190/0x1a0 fs/sync.c:202
generic_write_sync include/linux/fs.h:2920 [inline]
f2fs_file_write_iter+0x6d9/0x27a0 fs/f2fs/file.c:4933
call_write_iter include/linux/fs.h:2066 [inline]
new_sync_write fs/read_write.c:518 [inline]
vfs_write+0x758/0xdc0 fs/read_write.c:605
ksys_write+0x149/0x250 fs/read_write.c:658
__do_sys_write fs/read_write.c:670 [inline]
__se_sys_write fs/read_write.c:667 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:667
do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9d53b71e59
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:00007ffcbc3e4cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9d53deafa0 RCX: 00007f9d53b71e59
RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f9d53c07d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9d53deafac R14: 00007f9d53deafa0 R15: 00007f9d53deafa0
Modules linked in:
CR2: 0000000000000024
---[ end trace 28a2da5fdb436568 ]---
RIP: 0010:arch_atomic_inc fs/f2fs/segment.c:-1 [inline]
RIP: 0010:atomic_inc include/asm-generic/atomic-instrumented.h:241 [inline]
RIP: 0010:f2fs_issue_flush+0x172/0x8b0 fs/f2fs/segment.c:678
Code: 44 58 ff 4c 89 64 24 28 49 83 c4 24 4c 89 e7 be 04 00 00 00 e8 ef c4 92 ff 81 e3 00 04 00 00 0f 85 52 01 00 00 4c 89 64 24 08 <f0> 41 ff 04 24 4c 8b 74 24 20 4d 8d ae 6c 0c 00 00 4d 89 ec 49 c1
RSP: 0018:ffffc90000c37580 EFLAGS: 00010246
RAX: ffff88810c5aa700 RBX: 0000000000000000 RCX: 0000000000000286
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000ffffffff
RBP: ffffc90000c37690 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0dcfa48 R12: 0000000000000024
R13: ffffc90000c375e0 R14: 0000000000000000 R15: 1ffff92000186eb8
FS: 0000555570521500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000024 CR3: 0000000110146000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 44 58 rex.R pop %rax
2: ff 4c 89 64 decl 0x64(%rcx,%rcx,4)
6: 24 28 and $0x28,%al
8: 49 83 c4 24 add $0x24,%r12
c: 4c 89 e7 mov %r12,%rdi
f: be 04 00 00 00 mov $0x4,%esi
14: e8 ef c4 92 ff call 0xff92c508
19: 81 e3 00 04 00 00 and $0x400,%ebx
1f: 0f 85 52 01 00 00 jne 0x177
25: 4c 89 64 24 08 mov %r12,0x8(%rsp)
* 2a: f0 41 ff 04 24 lock incl (%r12) <-- trapping instruction
2f: 4c 8b 74 24 20 mov 0x20(%rsp),%r14
34: 4d 8d ae 6c 0c 00 00 lea 0xc6c(%r14),%r13
3b: 4d 89 ec mov %r13,%r12
3e: 49 rex.WB
3f: c1 .byte 0xc1