loop0: detected capacity change from 0 to 4096 NILFS (loop0): invalid segment: Checksum error in segment payload NILFS (loop0): trying rollback from an earlier position NILFS (loop0): recovery complete Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:nilfs_mdt_save_to_shadow_map+0x141/0x1c0 fs/nilfs2/mdt.c:559 Code: 3f 4c 8d 63 d8 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 1e ac 84 fe 4d 8b 24 24 49 83 c4 30 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 00 ac 84 fe 49 8b 34 24 4c 89 ff RSP: 0018:ffffc9000f527708 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffff8880560a07a8 RCX: 0000000000000002 RDX: ffff888041fa8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888041fa8000 R09: 0000000000000003 R10: 0000000000000406 R11: 0000000000000002 R12: 0000000000000030 R13: dffffc0000000000 R14: ffff8880387eb940 R15: ffff88805609fc48 FS: 00007fc55a0856c0(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc54d1ff000 CR3: 0000000033ba7000 CR4: 0000000000352ef0 Call Trace: nilfs_clean_segments+0x162/0xa50 fs/nilfs2/segment.c:2521 nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:916 [inline] nilfs_ioctl+0x261f/0x2780 fs/nilfs2/ioctl.c:1346 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc55919c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc55a084fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc559415fa0 RCX: 00007fc55919c799 RDX: 0000200000000640 RSI: 0000000040786e88 RDI: 0000000000000007 RBP: 00007fc559232c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc559416038 R14: 00007fc559415fa0 R15: 00007ffed4dfe218 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nilfs_mdt_save_to_shadow_map+0x141/0x1c0 fs/nilfs2/mdt.c:559 Code: 3f 4c 8d 63 d8 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 1e ac 84 fe 4d 8b 24 24 49 83 c4 30 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 00 ac 84 fe 49 8b 34 24 4c 89 ff RSP: 0018:ffffc9000f527708 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffff8880560a07a8 RCX: 0000000000000002 RDX: ffff888041fa8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888041fa8000 R09: 0000000000000003 R10: 0000000000000406 R11: 0000000000000002 R12: 0000000000000030 R13: dffffc0000000000 R14: ffff8880387eb940 R15: ffff88805609fc48 FS: 00007fc55a0856c0(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc54d1ff000 CR3: 0000000033ba7000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 4c 8d 63 d8 lea -0x28(%rbx),%r12 4: 4c 89 e0 mov %r12,%rax 7: 48 c1 e8 03 shr $0x3,%rax b: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 10: 74 08 je 0x1a 12: 4c 89 e7 mov %r12,%rdi 15: e8 1e ac 84 fe call 0xfe84ac38 1a: 4d 8b 24 24 mov (%r12),%r12 1e: 49 83 c4 30 add $0x30,%r12 22: 4c 89 e0 mov %r12,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 00 ac 84 fe call 0xfe84ac38 38: 49 8b 34 24 mov (%r12),%rsi 3c: 4c 89 ff mov %r15,%rdi