general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 1487 Comm: syz.5.425 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x4aa/0x1480 fs/f2fs/segment.c:2443 Code: 8b 45 d0 48 8d 58 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 23 ab 8a ff 48 8b 1b 4c 01 fb 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 95 0e 00 00 44 0f b6 33 44 89 f0 44 08 RSP: 0018:ffffc90011ceeac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff888133b30000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90011ceeb90 R08: ffff888131a1c006 R09: 1ffff11026343800 R10: dffffc0000000000 R11: ffffed1026343801 R12: 0000000000000080 R13: dffffc0000000000 R14: ffff888111e64000 R15: 0000000000000000 FS: 00007f515c2e96c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faaf23d7ff8 CR3: 00000001159b6000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: f2fs_allocate_data_block+0x146f/0x3ab0 fs/f2fs/segment.c:3434 do_write_page+0x277/0xb20 fs/f2fs/segment.c:3536 f2fs_outplace_write_data+0x14f/0x2e0 fs/f2fs/segment.c:3609 f2fs_do_write_data_page+0xe64/0x1500 fs/f2fs/data.c:2817 f2fs_write_single_data_page+0xa33/0x1730 fs/f2fs/data.c:2936 f2fs_write_cache_pages fs/f2fs/data.c:3188 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3363 [inline] f2fs_write_data_pages+0x14fe/0x2b10 fs/f2fs/data.c:3401 do_writepages+0x3ab/0x600 mm/page-writeback.c:2494 filemap_fdatawrite_wbc+0x128/0x190 mm/filemap.c:409 __filemap_fdatawrite_range mm/filemap.c:442 [inline] filemap_write_and_wait_range+0x131/0x210 mm/filemap.c:695 f2fs_flush_buffered_write fs/f2fs/file.c:4825 [inline] f2fs_file_write_iter+0x7d9/0x27c0 fs/f2fs/file.c:5039 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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: 0033:0x7f515b39de59 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:00007f515c2e9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f515b625fa0 RCX: 00007f515b39de59 RDX: 00000000ffffffd7 RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f515b433e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f515b626038 R14: 00007f515b625fa0 R15: 00007ffc9f699f08 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+0x4aa/0x1480 fs/f2fs/segment.c:2443 Code: 8b 45 d0 48 8d 58 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 23 ab 8a ff 48 8b 1b 4c 01 fb 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 95 0e 00 00 44 0f b6 33 44 89 f0 44 08 RSP: 0018:ffffc90011ceeac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff888133b30000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90011ceeb90 R08: ffff888131a1c006 R09: 1ffff11026343800 R10: dffffc0000000000 R11: ffffed1026343801 R12: 0000000000000080 R13: dffffc0000000000 R14: ffff888111e64000 R15: 0000000000000000 FS: 00007f515c2e96c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7ccf5eb540 CR3: 00000001159b6000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 8b 45 d0 mov -0x30(%rbp),%eax 3: 48 8d 58 18 lea 0x18(%rax),%rbx 7: 48 89 d8 mov %rbx,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 13: 74 08 je 0x1d 15: 48 89 df mov %rbx,%rdi 18: e8 23 ab 8a ff call 0xff8aab40 1d: 48 8b 1b mov (%rbx),%rbx 20: 4c 01 fb add %r15,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 95 0e 00 00 jne 0xecc 37: 44 0f b6 33 movzbl (%rbx),%r14d 3b: 44 89 f0 mov %r14d,%eax 3e: 44 rex.R 3f: 08 .byte 0x8