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: 5315 Comm: syz.4.61 Not tainted 5.15.185-syzkaller #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:2768 [inline] RIP: 0010:update_sit_entry+0x626/0xf30 fs/f2fs/segment.c:2305 Code: 01 00 00 48 8d 5d 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 47 ec 3e fe 48 8b 1b 4c 01 e3 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ae 07 00 00 0f b6 2b 89 e8 44 8b 74 24 RSP: 0018:ffffc90003d0e920 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888021e2d940 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880238ef090 R08: ffff888021e2d940 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff888026790000 R14: ffff88802b120240 R15: dffffc0000000000 FS: 00007f5797d176c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001740 CR3: 0000000022424000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x15fd/0x3610 fs/f2fs/segment.c:3432 do_write_page+0x156/0x6c0 fs/f2fs/segment.c:3520 f2fs_outplace_write_data+0xcb/0x1b0 fs/f2fs/segment.c:3586 f2fs_do_write_data_page+0xc0a/0x1230 fs/f2fs/data.c:2769 f2fs_write_single_data_page+0xfeb/0x1720 fs/f2fs/data.c:2893 f2fs_write_cache_pages fs/f2fs/data.c:3144 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3294 [inline] f2fs_write_data_pages+0x15b3/0x26b0 fs/f2fs/data.c:3321 do_writepages+0x48d/0x6d0 mm/page-writeback.c:2386 filemap_fdatawrite_wbc+0x1eb/0x240 mm/filemap.c:400 __filemap_fdatawrite_range mm/filemap.c:433 [inline] filemap_write_and_wait_range+0xfa/0x380 mm/filemap.c:704 __generic_file_write_iter+0x3af/0x4e0 mm/filemap.c:3898 f2fs_file_write_iter+0x71c/0xae0 fs/f2fs/file.c:4413 do_iter_readv_writev+0x497/0x600 fs/read_write.c:-1 do_iter_write+0x205/0x7b0 fs/read_write.c:855 iter_file_splice_write+0x65f/0xc40 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:936 splice_direct_to_actor+0x4dc/0xb50 fs/splice.c:891 do_splice_direct+0x1b9/0x2c0 fs/splice.c:979 do_sendfile+0x5d5/0xec0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64+0x13b/0x190 fs/read_write.c:1303 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: 0033:0x7f5798a96ff9 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:00007f5797d17038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5798c4ef80 RCX: 00007f5798a96ff9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 RBP: 00007f5798b09296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000800000100001 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5798c4ef80 R15: 00007ffe11f7cd68 Modules linked in: ---[ end trace 178eb393fd149f31 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2768 [inline] RIP: 0010:update_sit_entry+0x626/0xf30 fs/f2fs/segment.c:2305 Code: 01 00 00 48 8d 5d 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 47 ec 3e fe 48 8b 1b 4c 01 e3 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ae 07 00 00 0f b6 2b 89 e8 44 8b 74 24 RSP: 0018:ffffc90003d0e920 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888021e2d940 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880238ef090 R08: ffff888021e2d940 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff888026790000 R14: ffff88802b120240 R15: dffffc0000000000 FS: 00007f5797d176c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001740 CR3: 0000000022424000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 01 00 add %eax,(%rax) 2: 00 48 8d add %cl,-0x73(%rax) 5: 5d pop %rbp 6: 20 48 89 and %cl,-0x77(%rax) 9: d8 48 c1 fmuls -0x3f(%rax) c: e8 03 42 80 3c call 0x3c804214 11: 38 00 cmp %al,(%rax) 13: 74 08 je 0x1d 15: 48 89 df mov %rbx,%rdi 18: e8 47 ec 3e fe call 0xfe3eec64 1d: 48 8b 1b mov (%rbx),%rbx 20: 4c 01 e3 add %r12,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 ae 07 00 00 jne 0x7e5 37: 0f b6 2b movzbl (%rbx),%ebp 3a: 89 e8 mov %ebp,%eax 3c: 44 rex.R 3d: 8b .byte 0x8b 3e: 74 24 je 0x64