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: 1019 Comm: syz-executor398 Not tainted 6.1.138-syzkaller-00002-g13ff1300ee84 #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 7e 14 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:ffffc90002906e00 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88811f3a8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002906ed0 R08: ffff88811f3a8000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff88811ed840c8 R14: 0000000000000000 R15: 0000000000000080 FS: 00007ff5843786c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff584430858 CR3: 000000011dfd9000 CR4: 00000000003506a0 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 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x650/0xb10 fs/read_write.c:861 vfs_writev+0x30b/0x590 fs/read_write.c:934 do_pwritev fs/read_write.c:1031 [inline] __do_sys_pwritev2 fs/read_write.c:1090 [inline] __se_sys_pwritev2+0x1a9/0x2b0 fs/read_write.c:1081 __x64_sys_pwritev2+0xbf/0xd0 fs/read_write.c:1081 x64_sys_call+0x2d6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:329 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: 0033:0x7ff5843dcd49 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:00007ff584378208 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007ff58446a6d8 RCX: 00007ff5843dcd49 RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007ff58446a6d0 R08: 0000000000000007 R09: 0000000000000003 R10: 0000000000002000 R11: 0000000000000246 R12: 00007ff58443660c R13: 0000200000000000 R14: 0000200000000240 R15: 00002000000005c0 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 7e 14 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:ffffc90002906e00 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88811f3a8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002906ed0 R08: ffff88811f3a8000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff88811ed840c8 R14: 0000000000000000 R15: 0000000000000080 FS: 00007ff5843786c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555584616738 CR3: 000000011dfd9000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 5 bytes skipped: 0: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 4: 74 08 je 0xe 6: 48 89 df mov %rbx,%rdi 9: e8 7e 14 8d ff call 0xff8d148c e: 48 8b 1b mov (%rbx),%rbx 11: 4c 01 f3 add %r14,%rbx 14: 48 89 d8 mov %rbx,%rax 17: 48 c1 e8 03 shr $0x3,%rax 1b: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 22: fc ff df * 25: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 29: 84 c0 test %al,%al 2b: 0f 85 55 0f 00 00 jne 0xf86 31: 44 0f b6 23 movzbl (%rbx),%r12d 35: 44 89 e0 mov %r12d,%eax 38: 44 08 f8 or %r15b,%al