./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2187119919 <...> Warning: Permanently added '10.128.1.239' (ED25519) to the list of known hosts. execve("./syz-executor2187119919", ["./syz-executor2187119919"], 0x7ffff6f04c20 /* 10 vars */) = 0 brk(NULL) = 0x555585b2e000 brk(0x555585b2ed00) = 0x555585b2ed00 arch_prctl(ARCH_SET_FS, 0x555585b2e380) = 0 set_tid_address(0x555585b2e650) = 5218 set_robust_list(0x555585b2e660, 24) = 0 rseq(0x555585b2eca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2187119919", 4096) = 28 getrandom("\x11\xc5\x0a\x39\x3c\x21\xd6\x63", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555585b2ed00 brk(0x555585b4fd00) = 0x555585b4fd00 brk(0x555585b50000) = 0x555585b50000 mprotect(0x7f7895119000, 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 write(1, "executing program\n", 18executing program ) = 18 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f788cc00000 write(3, "\x60\x1c\x6d\x6b\x64\x20\x00\x66\x81\x7c\xe1\x00\x08\x08\x01\x00\x02\x40\x00\x40\x00\xf8\x01\x00\x10\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x90\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 131072) = 131072 munmap(0x7f788cc00000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 close(4) = 0 syzkaller login: [ 70.212293][ T5218] loop0: detected capacity change from 0 to 256 mkdir("./file1", 0777) = 0 mount("/dev/loop0", "./file1", "vfat", MS_NOSUID|MS_NOEXEC|MS_DIRSYNC|MS_I_VERSION|MS_LAZYTIME, "nonumtail=0,shortname=win95,errors=remount-ro,iocharset=cp855,uni_xlate=0,nonumtail=0,utf8=0,flush,r"...) = -1 EINVAL (Invalid argument) openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 [ 70.254971][ T5218] vfat: Unknown parameter 's' close(3) = 0 [ 70.298718][ T5218] ./file1: Can't lookup blockdev [ 70.307266][ T5218] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 70.315206][ T5218] #PF: supervisor instruction fetch in kernel mode [ 70.322161][ T5218] #PF: error_code(0x0010) - not-present page [ 70.328154][ T5218] PGD 8000000074401067 P4D 8000000074401067 PUD 74410067 PMD 0 [ 70.335922][ T5218] Oops: Oops: 0010 [#1] PREEMPT SMP KASAN PTI [ 70.342000][ T5218] CPU: 0 UID: 0 PID: 5218 Comm: syz-executor218 Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0 [ 70.352753][ T5218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 [ 70.362823][ T5218] RIP: 0010:0x0 [ 70.366303][ T5218] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 70.373691][ T5218] RSP: 0018:ffffc90002e7f9f8 EFLAGS: 00010293 [ 70.379771][ T5218] RAX: ffffffff81cd4cdc RBX: 0000000000000000 RCX: ffff88802c658000 [ 70.387759][ T5218] RDX: 0000000000000000 RSI: ffffea0001cd4f00 RDI: 0000000000000000 [ 70.395740][ T5218] RBP: ffffc90002e7fab0 R08: ffffffff81cd4ca6 R09: 1ffffd400039a9e0 [ 70.403734][ T5218] R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffffd400039a9e0 [ 70.411717][ T5218] R13: ffffea0001cd4f00 R14: ffffc90002e7fa40 R15: 1ffffd400039a9e1 [ 70.419706][ T5218] FS: 0000555585b2e380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 [ 70.428662][ T5218] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.435270][ T5218] CR2: ffffffffffffffd6 CR3: 0000000071830000 CR4: 00000000003506f0 [ 70.443265][ T5218] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 70.451331][ T5218] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.459406][ T5218] Call Trace: [ 70.462703][ T5218] [ 70.465673][ T5218] ? __die_body+0x5f/0xb0 [ 70.470038][ T5218] ? page_fault_oops+0x8e4/0xcc0 [ 70.475008][ T5218] ? __pfx_page_fault_oops+0x10/0x10 [ 70.480306][ T5218] ? __pfx_lock_acquire+0x10/0x10 [ 70.485430][ T5218] ? __folio_batch_add_and_move+0x81a/0xf00 [ 70.491339][ T5218] ? __pfx_lock_release+0x10/0x10 [ 70.496370][ T5218] ? rcu_is_watching+0x15/0xb0 [ 70.501160][ T5218] ? rcu_is_watching+0x15/0xb0 [ 70.505955][ T5218] ? is_errata93+0xbe/0x260 [ 70.510496][ T5218] ? exc_page_fault+0x5ed/0x8c0 [ 70.515373][ T5218] ? asm_exc_page_fault+0x26/0x30 [ 70.520422][ T5218] ? filemap_read_folio+0x106/0x630 [ 70.525633][ T5218] ? filemap_read_folio+0x13c/0x630 [ 70.530842][ T5218] filemap_read_folio+0x14b/0x630 [ 70.535877][ T5218] ? __pfx_filemap_read_folio+0x10/0x10 [ 70.541523][ T5218] ? __filemap_get_folio+0x949/0xbd0 [ 70.546834][ T5218] do_read_cache_folio+0x3f5/0x850 [ 70.551957][ T5218] erofs_bread+0x499/0xd40 [ 70.556407][ T5218] erofs_fc_fill_super+0x345/0x1770 [ 70.561652][ T5218] ? __pfx_erofs_fc_fill_super+0x10/0x10 [ 70.567301][ T5218] ? sget_fc+0x909/0x9c0 [ 70.571617][ T5218] ? __pfx_set_anon_super_fc+0x10/0x10 [ 70.577118][ T5218] ? __pfx_erofs_fc_fill_super+0x10/0x10 [ 70.582762][ T5218] get_tree_nodev+0xb7/0x140 [ 70.587578][ T5218] vfs_get_tree+0x90/0x2b0 [ 70.592038][ T5218] do_new_mount+0x2be/0xb40 [ 70.596605][ T5218] ? __pfx_do_new_mount+0x10/0x10 [ 70.601659][ T5218] __se_sys_mount+0x2d6/0x3c0 [ 70.606458][ T5218] ? __pfx___se_sys_mount+0x10/0x10 [ 70.611679][ T5218] ? do_syscall_64+0x100/0x230 [ 70.616482][ T5218] ? __x64_sys_mount+0x20/0xc0 [ 70.621303][ T5218] do_syscall_64+0xf3/0x230 [ 70.625815][ T5218] ? clear_bhb_loop+0x35/0x90 [ 70.630502][ T5218] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 70.636398][ T5218] RIP: 0033:0x7f78950a6af9 [ 70.640829][ T5218] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 [ 70.660456][ T5218] RSP: 002b:00007fff13b372f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 70.668898][ T5218] RAX: ffffffffffffffda RBX: 6d616e74726f6873 RCX: 00007f78950a6af9 [ 70.676890][ T5218] RDX: 00000000200005c0 RSI: 0000000020000580 RDI: 0000000020000540 [ 70.684963][ T5218] RBP: 0031656c69662f2e R08: 0000000000000000 R09: 0000000000000000 [ 70.693141][ T5218] R10: 0000000000200000 R11: 0000000000000246 R12: 74616c785f696e75 [ 70.701251][ T5218] R13: 746e6e69773d656d R14: 646578696d3d656d R15: 0000000000000001 [ 70.709252][ T5218] [ 70.712274][ T5218] Modules linked in: [ 70.716178][ T5218] CR2: 0000000000000000 [ 70.720356][ T5218] ---[ end trace 0000000000000000 ]--- [ 70.725911][ T5218] RIP: 0010:0x0 [ 70.729380][ T5218] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 70.736743][ T5218] RSP: 0018:ffffc90002e7f9f8 EFLAGS: 00010293 [ 70.742839][ T5218] RAX: ffffffff81cd4cdc RBX: 0000000000000000 RCX: ffff88802c658000 [ 70.750813][ T5218] RDX: 0000000000000000 RSI: ffffea0001cd4f00 RDI: 0000000000000000 [ 70.758786][ T5218] RBP: ffffc90002e7fab0 R08: ffffffff81cd4ca6 R09: 1ffffd400039a9e0 [ 70.766761][ T5218] R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffffd400039a9e0 [ 70.774745][ T5218] R13: ffffea0001cd4f00 R14: ffffc90002e7fa40 R15: 1ffffd400039a9e1 [ 70.782820][ T5218] FS: 0000555585b2e380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 [ 70.791933][ T5218] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.798806][ T5218] CR2: ffffffffffffffd6 CR3: 0000000071830000 CR4: 00000000003506f0 [ 70.807079][ T5218] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 70.815087][ T5218] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 70.823093][ T5218] Kernel panic - not syncing: Fatal exception [ 70.829623][ T5218] Kernel Offset: disabled [ 70.833957][ T5218] Rebooting in 86400 seconds..