./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor388431265 <...> DUID 00:04:7c:7c:42:18:3f:30:8d:b4:e2:57:c6:a5:0a:a4:65:8b forked to background, child pid 4645 [ 29.965444][ T4646] 8021q: adding VLAN 0 to HW filter on device bond0 [ 29.977296][ T4646] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.97' (ECDSA) to the list of known hosts. execve("./syz-executor388431265", ["./syz-executor388431265"], 0x7ffc50bc38b0 /* 10 vars */) = 0 brk(NULL) = 0x55555679e000 brk(0x55555679ec40) = 0x55555679ec40 arch_prctl(ARCH_SET_FS, 0x55555679e300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor388431265", 4096) = 27 brk(0x5555567bfc40) = 0x5555567bfc40 brk(0x5555567c0000) = 0x5555567c0000 mprotect(0x7fea43b10000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fea3b637000 write(3, "\xeb\x52\x90\x4e\x54\x46\x53\x20\x20\x20\x20\x00\x02\x08\x00\x00\x00\x00\x00\x00\x00\xf8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x00\x80\x00\xff\x0f\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x00\x00\x00\xf6\x00\x00\x00\x01\x00\x00\x00\x51\x49\x92\x54\x8e\xa5\x9a\x39\x00\x00\x00\x00\x0e\x1f\xbe\x71\x7c\xac\x22\xc0\x74\x0b\x56\xb4\x0e\xbb\x07\x00"..., 2097152) = 2097152 munmap(0x7fea3b637000, 2097152) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./file0", 0777) = 0 syzkaller login: [ 53.320568][ T5074] loop0: detected capacity change from 0 to 4096 [ 53.339449][ T5074] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN [ 53.351164][ T5074] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] [ 53.359558][ T5074] CPU: 0 PID: 5074 Comm: syz-executor388 Not tainted 6.1.0-syzkaller-13139-gf9ff5644bcc0 #0 [ 53.369598][ T5074] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 53.379630][ T5074] RIP: 0010:__d_instantiate+0x4fe/0x720 [ 53.385171][ T5074] Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 0a 11 ea ff 48 8b 1b 48 83 c3 08 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 e4 10 ea ff 48 83 3b 00 0f 85 aa 01 [ 53.404758][ T5074] RSP: 0018:ffffc90003d2fa48 EFLAGS: 00010202 [ 53.410807][ T5074] RAX: 0000000000000001 RBX: 0000000000000008 RCX: dffffc0000000000 [ 53.418760][ T5074] RDX: ffff888079d4d7c0 RSI: 0000000000000000 RDI: 0000000000000000 [ 53.426711][ T5074] RBP: 0000000000000000 R08: ffffffff81f75ca2 R09: fffff520007a5f44 [ 53.434671][ T5074] R10: fffff520007a5f45 R11: 1ffff920007a5f44 R12: 1ffff1100ebd27aa [ 53.442634][ T5074] R13: ffff88807876fd60 R14: 0000000000000008 R15: ffff888075e93d52 [ 53.450602][ T5074] FS: 000055555679e300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 [ 53.459511][ T5074] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.466076][ T5074] CR2: 00005643b107f6f8 CR3: 000000001e116000 CR4: 00000000003506f0 [ 53.474033][ T5074] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.481988][ T5074] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.489944][ T5074] Call Trace: [ 53.493203][ T5074] [ 53.496119][ T5074] d_make_root+0x9b/0xd0 [ 53.500347][ T5074] ntfs_fill_super+0x3faa/0x4370 [ 53.505274][ T5074] ? put_ntfs+0x2a0/0x2a0 [ 53.509588][ T5074] ? set_blocksize+0x1ec/0x390 [ 53.514342][ T5074] ? sb_set_blocksize+0x95/0xf0 [ 53.519175][ T5074] get_tree_bdev+0x400/0x620 [ 53.523750][ T5074] ? put_ntfs+0x2a0/0x2a0 [ 53.528062][ T5074] vfs_get_tree+0x88/0x270 [ 53.532457][ T5074] do_new_mount+0x289/0xad0 [ 53.536942][ T5074] ? do_move_mount_old+0x150/0x150 [ 53.542033][ T5074] ? user_path_at_empty+0x149/0x1a0 [ 53.547214][ T5074] __se_sys_mount+0x2d3/0x3c0 [ 53.551869][ T5074] ? __x64_sys_mount+0xc0/0xc0 [ 53.556612][ T5074] ? syscall_enter_from_user_mode+0x2e/0x1d0 [ 53.562578][ T5074] ? __x64_sys_mount+0x1c/0xc0 [ 53.567321][ T5074] do_syscall_64+0x3d/0xb0 [ 53.571722][ T5074] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 53.577594][ T5074] RIP: 0033:0x7fea43a84e9a [ 53.581990][ T5074] Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 53.601573][ T5074] RSP: 002b:00007ffef6a12d08 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 [ 53.609964][ T5074] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fea43a84e9a [ 53.617918][ T5074] RDX: 00000000200000c0 RSI: 000000002001f740 RDI: 00007ffef6a12d20 [ 53.625869][ T5074] RBP: 00007ffef6a12d20 R08: 00007ffef6a12d60 R09: 000000000001f724 [ 53.633818][ T5074] R10: 0000000000000c18 R11: 0000000000000286 R12: 0000000000000004 [ 53.641769][ T5074] R13: 000055555679e2c0 R14: 0000000000000c18 R15: 00007ffef6a12d60 [ 53.649724][ T5074] [ 53.652724][ T5074] Modules linked in: [ 53.656719][ T5074] ---[ end trace 0000000000000000 ]--- [ 53.662181][ T5074] RIP: 0010:__d_instantiate+0x4fe/0x720 [ 53.667788][ T5074] Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 0a 11 ea ff 48 8b 1b 48 83 c3 08 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 e4 10 ea ff 48 83 3b 00 0f 85 aa 01 [ 53.687428][ T5074] RSP: 0018:ffffc90003d2fa48 EFLAGS: 00010202 [ 53.693511][ T5074] RAX: 0000000000000001 RBX: 0000000000000008 RCX: dffffc0000000000 [ 53.701475][ T5074] RDX: ffff888079d4d7c0 RSI: 0000000000000000 RDI: 0000000000000000 [ 53.709471][ T5074] RBP: 0000000000000000 R08: ffffffff81f75ca2 R09: fffff520007a5f44 [ 53.717454][ T5074] R10: fffff520007a5f45 R11: 1ffff920007a5f44 R12: 1ffff1100ebd27aa [ 53.725440][ T5074] R13: ffff88807876fd60 R14: 0000000000000008 R15: ffff888075e93d52 [ 53.733418][ T5074] FS: 000055555679e300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 [ 53.742325][ T5074] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.748925][ T5074] CR2: 00005643b107f6f8 CR3: 000000001e116000 CR4: 00000000003506f0 [ 53.756907][ T5074] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.764901][ T5074] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.772881][ T5074] Kernel panic - not syncing: Fatal exception [ 53.779083][ T5074] Kernel Offset: disabled [ 53.783397][ T5074] Rebooting in 86400 seconds..