general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 315 Comm: syz-executor127 Not tainted 6.1.138-syzkaller-00008-g74db64dcc8aa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2941 [inline] RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2396 [inline] RIP: 0010:update_sit_entry+0x4f9/0x15a0 fs/f2fs/segment.c:2440 Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 ee 11 8d 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 55 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8 RSP: 0018:ffffc90000f36fc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88810fc81440 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000f37090 R08: ffff88810fc81440 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff8881142600c8 R14: 0000000000000000 R15: 0000000000000080 FS: 00007fe19d9226c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe19d921ff8 CR3: 0000000104517000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x148c/0x3af0 fs/f2fs/segment.c:3430 __allocate_data_block fs/f2fs/data.c:1488 [inline] f2fs_map_blocks+0x11a8/0x3a60 fs/f2fs/data.c:1671 f2fs_iomap_begin+0x1f5/0x920 fs/f2fs/data.c:4177 iomap_iter+0x5b7/0xb30 fs/iomap/iter.c:74 __iomap_dio_rw+0xc34/0x1bd0 fs/iomap/direct-io.c:607 f2fs_dio_write_iter fs/f2fs/file.c:4816 [inline] f2fs_file_write_iter+0x1559/0x2550 fs/f2fs/file.c:4932 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5db/0xca0 fs/read_write.c:584 ksys_write+0x140/0x240 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:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe19d986e49 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe19d922218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe19da136d8 RCX: 00007fe19d986e49 RDX: 000000000000003b RSI: 0000200000000080 RDI: 0000000000000004 RBP: 00007fe19da136d0 R08: 00007fe19d921fb7 R09: 0000000000000000 R10: 0000000000000014 R11: 0000000000000246 R12: 00007fe19d9db06b R13: 0000200000000088 R14: 0000200000000080 R15: 00002000000001c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2941 [inline] RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2396 [inline] RIP: 0010:update_sit_entry+0x4f9/0x15a0 fs/f2fs/segment.c:2440 Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 ee 11 8d 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 55 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8 RSP: 0018:ffffc90000f36fc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88810fc81440 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000f37090 R08: ffff88810fc81440 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff8881142600c8 R14: 0000000000000000 R15: 0000000000000080 FS: 00007fe19d9226c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555ed2738 CR3: 0000000104517000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: df 80 3c 08 00 74 filds 0x7400083c(%rax) 6: 08 48 89 or %cl,-0x77(%rax) 9: df e8 fucomip %st(0),%st b: ee out %al,(%dx) c: 11 8d ff 48 8b 1b adc %ecx,0x1b8b48ff(%rbp) 12: 4c 01 f3 add %r14,%rbx 15: 48 89 d8 mov %rbx,%rax 18: 48 c1 e8 03 shr $0x3,%rax 1c: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 23: fc ff df * 26: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2a: 84 c0 test %al,%al 2c: 0f 85 55 0f 00 00 jne 0xf87 32: 44 0f b6 23 movzbl (%rbx),%r12d 36: 44 89 e0 mov %r12d,%eax 39: 44 08 f8 or %r15b,%al