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: 940 Comm: syz.4.117 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2948 [inline] RIP: 0010:update_sit_entry+0x5b4/0xf70 fs/f2fs/segment.c:2256 Code: 00 00 49 8d 5d 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 ca 31 92 ff 48 8b 1b 48 03 5d b0 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 a9 08 00 00 44 0f b6 33 44 89 f0 44 8b RSP: 0018:ffffc900011a6f98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811a5f8000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900011a7018 R08: ffff88811a5f8000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88811d3d0878 R14: 0000000000000000 R15: ffff88810ff18000 FS: 00007f48820496c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4882048f98 CR3: 000000012fb5a000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x15e8/0x3240 fs/f2fs/segment.c:3457 do_write_page+0x13c/0xab0 fs/f2fs/segment.c:3547 f2fs_outplace_write_data+0xf6/0x240 fs/f2fs/segment.c:3621 f2fs_do_write_data_page+0x1002/0x1520 fs/f2fs/data.c:2733 f2fs_write_single_data_page+0x1098/0x1780 fs/f2fs/data.c:2855 f2fs_write_cache_pages fs/f2fs/data.c:3106 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3256 [inline] f2fs_write_data_pages+0x16f6/0x2770 fs/f2fs/data.c:3283 do_writepages+0x48a/0x6c0 mm/page-writeback.c:2388 filemap_fdatawrite_wbc+0x1f4/0x250 mm/filemap.c:409 __filemap_fdatawrite_range mm/filemap.c:442 [inline] filemap_write_and_wait_range+0xfa/0x380 mm/filemap.c:713 f2fs_symlink+0x5ec/0x880 fs/f2fs/namei.c:672 vfs_symlink+0x29e/0x470 fs/namei.c:4437 do_symlinkat+0x124/0x5a0 fs/namei.c:4466 __do_sys_symlink fs/namei.c:4488 [inline] __se_sys_symlink fs/namei.c:4486 [inline] __x64_sys_symlink+0x7e/0x90 fs/namei.c:4486 x64_sys_call+0x759/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:89 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f48821fa749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4882049038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00007f4882451090 RCX: 00007f48821fa749 RDX: 0000000000000000 RSI: 0000200000000cc0 RDI: 000020000000a900 RBP: 00007f488227ef91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4882451128 R14: 00007f4882451090 R15: 00007fff209fb138 Modules linked in: ---[ end trace 9ad38789b7093a90 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2948 [inline] RIP: 0010:update_sit_entry+0x5b4/0xf70 fs/f2fs/segment.c:2256 Code: 00 00 49 8d 5d 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 ca 31 92 ff 48 8b 1b 48 03 5d b0 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 a9 08 00 00 44 0f b6 33 44 89 f0 44 8b RSP: 0018:ffffc900011a6f98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811a5f8000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900011a7018 R08: ffff88811a5f8000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88811d3d0878 R14: 0000000000000000 R15: ffff88810ff18000 FS: 00007f48820496c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2dafcd4dac CR3: 000000012fb5a000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 49 8d 5d 18 lea 0x18(%r13),%rbx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 ca 31 92 ff call 0xff9231e6 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 03 5d b0 add -0x50(%rbp),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 a9 08 00 00 jne 0x8e0 37: 44 0f b6 33 movzbl (%rbx),%r14d 3b: 44 89 f0 mov %r14d,%eax 3e: 44 rex.R 3f: 8b .byte 0x8b