./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3268073913 <...> .203379][ T23] audit: type=1400 audit(1742678942.020:65): avc: denied { siginh } for pid=333 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.184' (ED25519) to the list of known hosts. execve("./syz-executor3268073913", ["./syz-executor3268073913"], 0x7ffc2dc356a0 /* 10 vars */) = 0 brk(NULL) = 0x55558c00c000 brk(0x55558c00cd00) = 0x55558c00cd00 arch_prctl(ARCH_SET_FS, 0x55558c00c380) = 0 set_tid_address(0x55558c00c650) = 368 set_robust_list(0x55558c00c660, 24) = 0 rseq(0x55558c00cca0, 0x20, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3268073913", 4096) = 28 getrandom("\xe5\x07\x47\x91\xd0\xec\xad\x6f", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558c00cd00 brk(0x55558c02dd00) = 0x55558c02dd00 brk(0x55558c02e000) = 0x55558c02e000 mprotect(0x7f4626be6000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 executing program mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 write(1, "executing program\n", 18) = 18 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f461e735000 write(3, "\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\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\x00\x00\x00\x00\x00\x00"..., 1048576) = 1048576 munmap(0x7f461e735000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 [ 36.041151][ T23] audit: type=1400 audit(1742678958.910:66): avc: denied { execmem } for pid=368 comm="syz-executor326" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 36.063644][ T23] audit: type=1400 audit(1742678958.930:67): avc: denied { read write } for pid=368 comm="syz-executor326" name="loop0" dev="devtmpfs" ino=9410 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 close(4) = 0 [ 36.087743][ T23] audit: type=1400 audit(1742678958.930:68): avc: denied { open } for pid=368 comm="syz-executor326" path="/dev/loop0" dev="devtmpfs" ino=9410 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 36.111681][ T23] audit: type=1400 audit(1742678958.930:69): avc: denied { ioctl } for pid=368 comm="syz-executor326" path="/dev/loop0" dev="devtmpfs" ino=9410 ioctlcmd=0x4c00 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 mkdir("./file0", 0777) = 0 [ 36.192797][ T23] audit: type=1400 audit(1742678959.060:70): avc: denied { mounton } for pid=368 comm="syz-executor326" path="/root/file0" dev="sda1" ino=1927 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 mount("/dev/loop0", "./file0", "ext4", MS_DIRSYNC|MS_NOATIME|MS_LAZYTIME, "jqfmt=vfsv0,errors=remount-ro,") = 0 openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 chdir("./file0") = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 openat(AT_FDCWD, "./bus", O_RDWR|O_CREAT|O_NONBLOCK|O_SYNC|O_NOATIME, 000) = 4 mount("/dev/loop0", "./bus", NULL, MS_BIND, NULL) = 0 open("./bus", O_RDWR|O_NOCTTY|O_SYNC|O_DIRECT|O_CLOEXEC|FASYNC) = 5 mmap(0x200000000000, 8388608, PROT_WRITE, MAP_SHARED|MAP_FIXED|MAP_POPULATE|MAP_STACK, 5, 0) = 0x200000000000 bind(-1, 0x200000000400, 110) = -1 EBADF (Bad file descriptor) openat(AT_FDCWD, 0x200000000000, O_RDONLY) = 6 [ 36.251429][ T368] EXT4-fs (loop0): mounted filesystem without journal. Opts: jqfmt=vfsv0,errors=remount-ro, [ 36.261601][ T23] audit: type=1400 audit(1742678959.130:71): avc: denied { mount } for pid=368 comm="syz-executor326" name="/" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fs_t tclass=filesystem permissive=1 [ 36.283873][ T23] audit: type=1400 audit(1742678959.130:72): avc: denied { write } for pid=368 comm="syz-executor326" name="/" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 36.291130][ T368] EXT4-fs error (device loop0): ext4_mb_generate_buddy:748: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters [ 36.306098][ T23] audit: type=1400 audit(1742678959.130:73): avc: denied { add_name } for pid=368 comm="syz-executor326" name="bus" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 36.320786][ T368] EXT4-fs (loop0): Remounting filesystem read-only [ 36.346917][ T23] audit: type=1400 audit(1742678959.130:74): avc: denied { create } for pid=368 comm="syz-executor326" name="bus" scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:unlabeled_t tclass=file permissive=1 [ 36.347142][ T368] ------------[ cut here ]------------ [ 36.372207][ T368] kernel BUG at fs/ext4/ext4.h:2985! [ 36.377465][ T23] audit: type=1400 audit(1742678959.130:75): avc: denied { read write open } for pid=368 comm="syz-executor326" path="/root/file0/bus" dev="loop0" ino=18 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:unlabeled_t tclass=file permissive=1 [ 36.377526][ T368] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 36.406863][ T368] CPU: 1 PID: 368 Comm: syz-executor326 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0 [ 36.416839][ T368] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 36.426764][ T368] RIP: 0010:ext4_trim_fs+0x1ec8/0x1ee0 [ 36.432027][ T368] Code: 80 e1 07 80 c1 03 38 c1 0f 8c fd e6 ff ff 48 8d bc 24 10 02 00 00 e8 77 a3 c8 ff e9 eb e6 ff ff e8 5d 5c 6f ff e8 48 b9 98 ff <0f> 0b e8 41 b9 98 ff 0f 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f [ 36.451482][ T368] RSP: 0018:ffff8881ee7cf4e0 EFLAGS: 00010293 [ 36.457369][ T368] RAX: ffffffff81cb91b8 RBX: 0000000000000001 RCX: ffff8881f32f9f80 [ 36.465179][ T368] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 [ 36.472993][ T368] RBP: ffff8881ee7cf770 R08: ffffffff81cb7ad4 R09: 0000000000000003 [ 36.480805][ T368] R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 [ 36.488615][ T368] R13: 0000000000003fff R14: ffff8881eef33000 R15: 0000000000000001 [ 36.496432][ T368] FS: 000055558c00c380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 [ 36.505204][ T368] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.511616][ T368] CR2: 00007ffc2dc33d08 CR3: 00000001eecce000 CR4: 00000000003406a0 [ 36.519430][ T368] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.527237][ T368] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.535046][ T368] Call Trace: [ 36.538185][ T368] ? __die+0xb4/0x100 [ 36.542001][ T368] ? die+0x26/0x50 [ 36.545554][ T368] ? do_trap+0x1e7/0x340 [ 36.549637][ T368] ? ext4_trim_fs+0x1ec8/0x1ee0 [ 36.554323][ T368] ? ext4_trim_fs+0x1ec8/0x1ee0 [ 36.559011][ T368] ? do_invalid_op+0xfb/0x110 [ 36.563520][ T368] ? ext4_trim_fs+0x1ec8/0x1ee0 [ 36.568216][ T368] ? invalid_op+0x1e/0x30 [ 36.572375][ T368] ? ext4_trim_fs+0x7e4/0x1ee0 [ 36.576974][ T368] ? ext4_trim_fs+0x1ec8/0x1ee0 [ 36.581789][ T368] ? ext4_trim_fs+0x1ec8/0x1ee0 [ 36.586485][ T368] ? ext4_group_add_blocks+0xde0/0xde0 [ 36.591771][ T368] ? update_load_avg+0x40f/0x1210 [ 36.596633][ T368] ? cap_capable+0x1b1/0x250 [ 36.601057][ T368] ? check_preemption_disabled+0x9f/0x320 [ 36.606616][ T368] ext4_ioctl+0x2168/0x3ff0 [ 36.610952][ T368] ? check_preempt_wakeup+0x4f6/0x9f0 [ 36.616167][ T368] ? asan.module_dtor+0x20/0x20 [ 36.620846][ T368] ? ttwu_do_wakeup+0x161/0x480 [ 36.625535][ T368] ? check_preemption_disabled+0x9f/0x320 [ 36.631089][ T368] ? try_to_wake_up+0x7c5/0x14f0 [ 36.635859][ T368] ? debug_smp_processor_id+0x20/0x20 [ 36.641072][ T368] ? check_preemption_disabled+0x9f/0x320 [ 36.646641][ T368] ? avc_has_extended_perms+0xb03/0x1120 [ 36.652105][ T368] ? avc_flush+0x1f0/0x1f0 [ 36.656348][ T368] ? finish_task_switch+0x130/0x590 [ 36.661388][ T368] ? _raw_spin_lock_irqsave+0x210/0x210 [ 36.666771][ T368] ? ptrace_stop+0x6ee/0xa30 [ 36.671193][ T368] ? asan.module_dtor+0x20/0x20 [ 36.675878][ T368] do_vfs_ioctl+0x742/0x1720 [ 36.680303][ T368] ? ioctl_preallocate+0x250/0x250 [ 36.685250][ T368] ? check_preemption_disabled+0x153/0x320 [ 36.690895][ T368] ? syscall_trace_enter+0x650/0x940 [ 36.696012][ T368] ? do_syscall_64+0x1c0/0x1c0 [ 36.700609][ T368] ? switch_fpu_return+0x1d4/0x410 [ 36.705558][ T368] ? security_file_ioctl+0x7d/0xa0 [ 36.710505][ T368] __x64_sys_ioctl+0xd4/0x110 [ 36.715028][ T368] do_syscall_64+0xca/0x1c0 [ 36.719362][ T368] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 36.725116][ T368] RIP: 0033:0x7f4626b72879 [ 36.729339][ T368] 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 [ 36.748784][ T368] RSP: 002b:00007fffd3059448 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 36.757051][ T368] RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f4626b72879 [ 36.764835][ T368] RDX: 0000200000000240 RSI: 00000000c0185879 RDI: 0000000000000006 [ 36.772648][ T368] RBP: 0000200000000000 R08: 0000000000000000 R09: 00000000000b15f8 [ 36.780464][ T368] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 36.788269][ T368] R13: 00007fffd3059618 R14: 0000000000000001 R15: 0000000000000001 [ 36.796087][ T368] Modules linked in: [ 36.802128][ T368] ---[ end trace db85b38581cbe57e ]--- [ 36.807409][ T368] RIP: 0010:ext4_trim_fs+0x1ec8/0x1ee0 [ 36.812756][ T368] Code: 80 e1 07 80 c1 03 38 c1 0f 8c fd e6 ff ff 48 8d bc 24 10 02 00 00 e8 77 a3 c8 ff e9 eb e6 ff ff e8 5d 5c 6f ff e8 48 b9 98 ff <0f> 0b e8 41 b9 98 ff 0f 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f [ 36.832164][ T368] RSP: 0018:ffff8881ee7cf4e0 EFLAGS: 00010293 [ 36.838035][ T368] RAX: ffffffff81cb91b8 RBX: 0000000000000001 RCX: ffff8881f32f9f80 [ 36.845878][ T368] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 [ 36.853684][ T368] RBP: ffff8881ee7cf770 R08: ffffffff81cb7ad4 R09: 0000000000000003 [ 36.861509][ T368] R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 [ 36.869306][ T368] R13: 0000000000003fff R14: ffff8881eef33000 R15: 0000000000000001 [ 36.877095][ T368] FS: 000055558c00c380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 [ 36.885890][ T368] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.892303][ T368] CR2: 000055cf5ccf4078 CR3: 00000001eecce000 CR4: 00000000003406b0 [ 36.900121][ T368] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.907907][ T368] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.915755][ T368] Kernel panic - not syncing: Fatal exception [ 36.921916][ T368] Kernel Offset: disabled [ 36.926064][ T368] Rebooting in 86400 seconds..