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: 506 Comm: syz.2.20 Not tainted 5.15.180-syzkaller-1080241-g57b1420d5e49 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2931 [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 0a 5b 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:ffffc90001506d20 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811d163b40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001506da0 R08: ffff88811d163b40 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88811e5ac9b8 R14: 0000000000000000 R15: ffff88811dfb4000 FS: 00007fed96dbd6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fed96dbcf98 CR3: 000000011a6cc000 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 __allocate_data_block+0x526/0xa00 fs/f2fs/data.c:1404 f2fs_map_blocks+0xeea/0x38a0 fs/f2fs/data.c:1576 f2fs_iomap_begin+0x1fc/0x8d0 fs/f2fs/data.c:4191 iomap_iter+0x57d/0xaf0 fs/iomap/iter.c:74 __iomap_dio_rw+0xa15/0x19f0 fs/iomap/direct-io.c:597 f2fs_dio_write_iter fs/f2fs/file.c:4620 [inline] f2fs_file_write_iter+0xf96/0x2910 fs/f2fs/file.c:4752 do_iter_readv_writev+0x491/0x600 fs/read_write.c:-1 do_iter_write+0x1fa/0x7b0 fs/read_write.c:855 vfs_writev+0x2c9/0x540 fs/read_write.c:928 do_pwritev fs/read_write.c:1025 [inline] __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2+0x1a9/0x2b0 fs/read_write.c:1075 __x64_sys_pwritev2+0xbf/0xd0 fs/read_write.c:1075 x64_sys_call+0x346/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:329 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: 0033:0x7fed9735d819 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:00007fed96dbd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fed97515080 RCX: 00007fed9735d819 RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000007 RBP: 00007fed973d075e R08: 0000000000000007 R09: 0000000000000003 R10: 0000000000002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fed97515080 R15: 00007ffd863a4098 Modules linked in: ---[ end trace e05789065632ffd2 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2931 [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 0a 5b 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:ffffc90001506d20 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88811d163b40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001506da0 R08: ffff88811d163b40 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88811e5ac9b8 R14: 0000000000000000 R15: ffff88811dfb4000 FS: 00007fed96dbd6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000011a6cc000 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 0a 5b 92 ff call 0xff925b26 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