NILFS (loop4): discard dirty block: blocknr=0, size=1024 NILFS (loop4): discard dirty block: blocknr=0, size=1024 NILFS (loop4): discard dirty block: blocknr=0, size=1024 NILFS (loop4): discard dirty block: blocknr=0, size=1024 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: 10882 Comm: syz-executor.4 Not tainted 6.4.0-rc4-syzkaller-00031-g8b817fded42d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 RIP: 0010:nilfs_clear_dirty_page+0xa9/0x1130 fs/nilfs2/page.c:388 Code: 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 eb 58 97 fe 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 c9 58 97 fe 4c 8b 2b 49 8d 5d 28 48 RSP: 0018:ffffc90008e1f2e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffffc9000b839000 RSI: 000000000003f2b8 RDI: 000000000003f2b9 RBP: ffffc90008e1f3b0 R08: ffffffff834bc939 R09: fffff9400041a3f9 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea00020d1fc0 R13: 0000000000000000 R14: dffffc0000000000 R15: dffffc0000000000 FS: 00007f553d124700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa295d86058 CR3: 000000001e3bc000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nilfs_clear_dirty_pages+0x1e0/0x370 fs/nilfs2/page.c:373 nilfs_writepages+0x11c/0x160 fs/nilfs2/inode.c:165 do_writepages+0x3a6/0x670 mm/page-writeback.c:2551 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:390 __filemap_fdatawrite_range mm/filemap.c:423 [inline] filemap_write_and_wait_range+0x1d4/0x2c0 mm/filemap.c:678 generic_file_read_iter+0x19e/0x540 mm/filemap.c:2805 call_read_iter include/linux/fs.h:1862 [inline] generic_file_splice_read+0x240/0x640 fs/splice.c:419 do_splice_to fs/splice.c:902 [inline] splice_direct_to_actor+0x40c/0xbd0 fs/splice.c:973 do_splice_direct+0x283/0x3d0 fs/splice.c:1082 do_sendfile+0x620/0xff0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f553c48c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f553d124168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f553c5abf80 RCX: 00007f553c48c169 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f553c4e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcec4d577f R14: 00007f553d124300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nilfs_clear_dirty_page+0xa9/0x1130 fs/nilfs2/page.c:388 Code: 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 eb 58 97 fe 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 c9 58 97 fe 4c 8b 2b 49 8d 5d 28 48 RSP: 0018:ffffc90008e1f2e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffffc9000b839000 RSI: 000000000003f2b8 RDI: 000000000003f2b9 RBP: ffffc90008e1f3b0 R08: ffffffff834bc939 R09: fffff9400041a3f9 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea00020d1fc0 R13: 0000000000000000 R14: dffffc0000000000 R15: dffffc0000000000 FS: 00007f553d124700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2dd23000 CR3: 000000001e3bc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 89 d8 mov %rbx,%rax 3: 48 c1 e8 03 shr $0x3,%rax 7: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) c: 74 08 je 0x16 e: 48 89 df mov %rbx,%rdi 11: e8 eb 58 97 fe callq 0xfe975901 16: 48 8b 1b mov (%rbx),%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 c9 58 97 fe callq 0xfe975901 38: 4c 8b 2b mov (%rbx),%r13 3b: 49 8d 5d 28 lea 0x28(%r13),%rbx 3f: 48 rex.W