./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2300217264 <...> Warning: Permanently added '10.128.1.4' (ECDSA) to the list of known hosts. execve("./syz-executor2300217264", ["./syz-executor2300217264"], 0x7ffdc3a28230 /* 10 vars */) = 0 brk(NULL) = 0x555557389000 brk(0x555557389c40) = 0x555557389c40 arch_prctl(ARCH_SET_FS, 0x555557389300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor2300217264", 4096) = 28 brk(0x5555573aac40) = 0x5555573aac40 brk(0x5555573ab000) = 0x5555573ab000 mprotect(0x7fdafa927000, 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 ftruncate(3, 135266304) = 0 pwrite64(3, "\xe3\x59\xb7\x7c\xac\x99\xe0", 7, 0) = 7 pwrite64(3, "\x9b\x61\xf3\xe0\xbd\x92\x26\x62\x88\xa6\x67\x32\x79\x7b\x23\x64\xf5\xec\xa3\x08\x4d\xa8\xa7\x77\x51\x12\xb4\x26\xdf\x20\x4d\xb3\xf5\x9b\x71\xa7\x2c\x65\x5e\x87\x57\xba\x78\x79\x90\x34\xb9\xdf\xde\xd3\x44\x73\xfb\xe8\xc2\xb5\xb5\x99\xe3\x27\x0a\x00\x76\x1e\xea\x8a\x4b\xe5\x10\xc7\x23\x6b\xe1\x09\x9a\x3c\xc2\x50\xf5\xdf\xc7\x63\x1c\xc6\x2d\xdf\x56\x2b\x01\xa5\x61\x9f\xcd\x82\xe6", 95, 7) = 95 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 mkdir("./file0", 0777) = 0 syzkaller login: [ 38.911516][ T3602] loop0: detected capacity change from 0 to 264192 [ 38.919955][ T3602] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 38.931680][ T3602] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 38.940075][ T3602] CPU: 0 PID: 3602 Comm: syz-executor230 Not tainted 6.1.0-rc1-next-20221021-syzkaller #0 [ 38.949944][ T3602] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 38.959988][ T3602] RIP: 0010:strnlen+0x3b/0x70 [ 38.964659][ T3602] Code: 74 3c 48 bb 00 00 00 00 00 fc ff df 49 89 fc 48 89 f8 eb 09 48 83 c0 01 48 39 e8 74 1e 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <0f> b6 14 1a 38 ca 7f 04 84 d2 75 11 80 38 00 75 d9 4c 29 e0 48 83 [ 38.984250][ T3602] RSP: 0018:ffffc90003b6fb40 EFLAGS: 00010246 [ 38.990300][ T3602] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 [ 38.998253][ T3602] RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000000000000 [ 39.006205][ T3602] RBP: 0000000000000040 R08: 0000000000000005 R09: 0000000000000017 [ 39.014159][ T3602] R10: 0000000000000002 R11: 000000000008c001 R12: 0000000000000000 [ 39.022114][ T3602] R13: 0000000000000000 R14: ffff8880217bf680 R15: ffff88807ccb24d0 [ 39.030085][ T3602] FS: 0000555557389300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 [ 39.039001][ T3602] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.045569][ T3602] CR2: 00000000005d84c8 CR3: 0000000026706000 CR4: 00000000003506f0 [ 39.053525][ T3602] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.061484][ T3602] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.069438][ T3602] Call Trace: [ 39.072699][ T3602] [ 39.075624][ T3602] gfs2_parse_param+0x1e6/0xe50 [ 39.080465][ T3602] ? gfs2_parse_param+0x0/0xe50 [ 39.085303][ T3602] ? __fs_parse+0x269/0x890 [ 39.089797][ T3602] ? bpf_lsm_sb_alloc_security-0xb/0x10 [ 39.095330][ T3602] ? gfs2_parse_param+0x0/0xe50 [ 39.100166][ T3602] vfs_parse_fs_param+0x1f9/0x3c0 [ 39.105178][ T3602] vfs_parse_fs_string+0xdb/0x170 [ 39.110189][ T3602] ? vfs_parse_fs_string+0x0/0x170 [ 39.115288][ T3602] ? gfs2_parse_param+0x0/0xe50 [ 39.120127][ T3602] ? rcu_read_lock_sched_held+0xd/0x70 [ 39.125592][ T3602] ? kfree+0x122/0x1a0 [ 39.129647][ T3602] ? bpf_lsm_sb_mnt_opts_compat-0xb/0x10 [ 39.135270][ T3602] generic_parse_monolithic+0x16f/0x1f0 [ 39.140804][ T3602] ? generic_parse_monolithic+0x0/0x1f0 [ 39.146336][ T3602] ? alloc_fs_context+0x5cb/0xa00 [ 39.151348][ T3602] path_mount+0x12de/0x1e20 [ 39.155838][ T3602] ? kmem_cache_free+0xea/0x5b0 [ 39.160677][ T3602] ? path_mount+0x0/0x1e20 [ 39.165078][ T3602] ? putname+0xfe/0x140 [ 39.169233][ T3602] __x64_sys_mount+0x27f/0x300 [ 39.173979][ T3602] ? __x64_sys_mount+0x0/0x300 [ 39.178741][ T3602] ? _raw_spin_unlock_irq+0x2a/0x40 [ 39.183922][ T3602] ? ptrace_notify+0xfa/0x140 [ 39.188586][ T3602] do_syscall_64+0x35/0xb0 [ 39.192989][ T3602] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 39.198870][ T3602] RIP: 0033:0x7fdafa8bc4ba [ 39.203269][ T3602] 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 [ 39.222877][ T3602] RSP: 002b:00007ffe056c9ee8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 [ 39.231276][ T3602] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fdafa8bc4ba [ 39.239232][ T3602] RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 00007ffe056c9f00 [ 39.247186][ T3602] RBP: 00007ffe056c9f00 R08: 00007ffe056c9f40 R09: 00005555573892c0 [ 39.255139][ T3602] R10: 000000000180c082 R11: 0000000000000282 R12: 0000000000000004 [ 39.263095][ T3602] R13: 00007ffe056c9f40 R14: 0000000000000002 R15: 0000000020000330 [ 39.271053][ T3602] [ 39.274075][ T3602] Modules linked in: [ 39.278680][ T3602] ---[ end trace 0000000000000000 ]--- [ 39.284263][ T3602] RIP: 0010:strnlen+0x3b/0x70 [ 39.288943][ T3602] Code: 74 3c 48 bb 00 00 00 00 00 fc ff df 49 89 fc 48 89 f8 eb 09 48 83 c0 01 48 39 e8 74 1e 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <0f> b6 14 1a 38 ca 7f 04 84 d2 75 11 80 38 00 75 d9 4c 29 e0 48 83 [ 39.308595][ T3602] RSP: 0018:ffffc90003b6fb40 EFLAGS: 00010246 [ 39.314684][ T3602] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 [ 39.322670][ T3602] RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000000000000 [ 39.330644][ T3602] RBP: 0000000000000040 R08: 0000000000000005 R09: 0000000000000017 [ 39.338631][ T3602] R10: 0000000000000002 R11: 000000000008c001 R12: 0000000000000000 [ 39.346641][ T3602] R13: 0000000000000000 R14: ffff8880217bf680 R15: ffff88807ccb24d0 [ 39.354632][ T3602] FS: 0000555557389300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 [ 39.363608][ T3602] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.370353][ T3602] CR2: 000000000061ba0c CR3: 0000000026706000 CR4: 00000000003506e0 [ 39.378343][ T3602] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.386355][ T3602] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.394354][ T3602] Kernel panic - not syncing: Fatal exception [ 39.400567][ T3602] Kernel Offset: disabled [ 39.404884][ T3602] Rebooting in 86400 seconds..