./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4219177980 <...> Warning: Permanently added '10.128.0.40' (ED25519) to the list of known hosts. execve("./syz-executor4219177980", ["./syz-executor4219177980"], 0x7ffe3b381da0 /* 10 vars */) = 0 brk(NULL) = 0x555567eb7000 brk(0x555567eb7d00) = 0x555567eb7d00 arch_prctl(ARCH_SET_FS, 0x555567eb7380) = 0 set_tid_address(0x555567eb7650) = 5839 set_robust_list(0x555567eb7660, 24) = 0 rseq(0x555567eb7ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor4219177980", 4096) = 28 getrandom("\xcf\x9d\xd8\xff\x8d\x30\x96\x72", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555567eb7d00 brk(0x555567ed8d00) = 0x555567ed8d00 brk(0x555567ed9000) = 0x555567ed9000 mprotect(0x7f84be891000, 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 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = -1 ENXIO (No such device or address) close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5840 attached [pid 5840] set_robust_list(0x555567eb7660, 24) = 0 [pid 5840] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5840] setpgid(0, 0) = 0 [pid 5840] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC [pid 5839] <... clone resumed>, child_tidptr=0x555567eb7650) = 5840 [pid 5840] <... openat resumed>) = 3 [pid 5840] write(3, "1000", 4) = 4 [pid 5840] close(3) = 0 executing program [pid 5840] write(1, "executing program\n", 18) = 18 [pid 5840] memfd_create("syzkaller", 0) = 3 [pid 5840] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f84b6200000 [pid 5840] 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"..., 16777216) = 16777216 [pid 5840] munmap(0x7f84b6200000, 138412032) = 0 [pid 5840] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5840] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5840] close(3) = 0 [pid 5840] close(4) = 0 [pid 5840] mkdir("./bus", 0777) = 0 [pid 5840] mount("/dev/loop0", "./bus", "jfs", 0, "") = 0 [pid 5840] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 3 [pid 5840] chdir("./bus") = 0 [pid 5840] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [ 248.179482][ T5840] loop0: detected capacity change from 0 to 32768 [pid 5840] mknod("./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", S_ISGID|010 [pid 5839] kill(-5840, SIGKILL) = 0 [pid 5839] kill(5840, SIGKILL) = 0 [pid 5839] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5839] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5839] getdents64(3, 0x555567eb86f0 /* 2 entries */, 32768) = 48 [pid 5839] getdents64(3, 0x555567eb86f0 /* 0 entries */, 32768) = 0 [pid 5839] close(3) = 0 [ 429.728325][ T31] INFO: task kworker/u8:6:1003 blocked for more than 143 seconds. [ 429.736257][ T31] Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 [ 429.745538][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 429.754632][ T31] task:kworker/u8:6 state:D stack:24152 pid:1003 tgid:1003 ppid:2 task_flags:0x4208060 flags:0x00004000 [ 429.767072][ T31] Workqueue: writeback wb_workfn (flush-7:0) [ 429.773458][ T31] Call Trace: [ 429.776789][ T31] [ 429.780120][ T31] __schedule+0x168f/0x4c70 [ 429.784672][ T31] ? blk_mq_flush_plug_list+0x163a/0x1760 [ 429.790896][ T31] ? __pfx_blk_mq_flush_plug_list+0x10/0x10 [ 429.796823][ T31] ? schedule+0x165/0x360 [ 429.801538][ T31] ? __pfx___schedule+0x10/0x10 [ 429.806429][ T31] ? schedule+0x91/0x360 [ 429.811049][ T31] schedule+0x165/0x360 [ 429.815241][ T31] schedule_preempt_disabled+0x13/0x30 [ 429.821087][ T31] __mutex_lock+0x724/0xe80 [ 429.825633][ T31] ? __mutex_lock+0x51b/0xe80 [ 429.830696][ T31] ? jfs_commit_inode+0x1ca/0x530 [ 429.835759][ T31] ? __pfx___mutex_lock+0x10/0x10 [ 429.841207][ T31] ? inode_to_bdi+0x69/0xf0 [ 429.845764][ T31] jfs_commit_inode+0x1ca/0x530 [ 429.851192][ T31] ? __pfx_jfs_commit_inode+0x10/0x10 [ 429.856606][ T31] jfs_write_inode+0x145/0x220 [ 429.861962][ T31] __writeback_single_inode+0x6ee/0xff0 [ 429.867550][ T31] writeback_sb_inodes+0x6b5/0x1000 [ 429.873216][ T31] ? __pfx_writeback_sb_inodes+0x10/0x10 [ 429.879141][ T31] ? __pfx___up_read+0x10/0x10 [ 429.883947][ T31] __writeback_inodes_wb+0x111/0x240 [ 429.889693][ T31] wb_writeback+0x44f/0xaf0 [ 429.894243][ T31] ? queue_io+0x301/0x590 [ 429.898958][ T31] ? __pfx_wb_writeback+0x10/0x10 [ 429.904030][ T31] wb_workfn+0xaef/0xef0 [ 429.908714][ T31] ? __pfx_wb_workfn+0x10/0x10 [ 429.913496][ T31] ? register_lock_class+0x51/0x320 [ 429.919099][ T31] ? __lock_acquire+0xaac/0xd20 [ 429.923981][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.930101][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 429.935329][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.941440][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.947195][ T31] process_scheduled_works+0xadb/0x17a0 [ 429.953167][ T31] ? __pfx_process_scheduled_works+0x10/0x10 [ 429.959609][ T31] worker_thread+0x8a0/0xda0 [ 429.964231][ T31] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 429.971353][ T31] ? __kthread_parkme+0x7b/0x200 [ 429.976336][ T31] kthread+0x70e/0x8a0 [ 429.980763][ T31] ? __pfx_worker_thread+0x10/0x10 [ 429.985967][ T31] ? __pfx_kthread+0x10/0x10 [ 429.991017][ T31] ? __pfx_kthread+0x10/0x10 [ 429.995650][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.001248][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.006476][ T31] ? __pfx_kthread+0x10/0x10 [ 430.011500][ T31] ret_from_fork+0x4b/0x80 [ 430.015943][ T31] ? __pfx_kthread+0x10/0x10 [ 430.020927][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.025743][ T31] [ 430.029337][ T31] [ 430.029337][ T31] Showing all locks held in the system: [ 430.037080][ T31] 1 lock held by khungtaskd/31: [ 430.042449][ T31] #0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 430.052575][ T31] 4 locks held by kworker/u8:6/1003: [ 430.057871][ T31] #0: ffff88801c6f4148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 [ 430.069587][ T31] #1: ffffc90003a1fc60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 [ 430.082828][ T31] #2: ffff88807bd760e0 (&type->s_umount_key#43){.+.+}-{4:4}, at: super_trylock_shared+0x20/0xf0 [ 430.093701][ T31] #3: ffff8880774cafe0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 [ 430.104318][ T31] 2 locks held by getty/5570: [ 430.109250][ T31] #0: ffff88814e4770a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 430.119269][ T31] #1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 430.129715][ T31] 4 locks held by syz-executor421/5840: [ 430.135277][ T31] [ 430.137613][ T31] ============================================= [ 430.137613][ T31] [ 430.146603][ T31] NMI backtrace for cpu 1 [ 430.146624][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT(full) [ 430.146648][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 [ 430.146659][ T31] Call Trace: [ 430.146667][ T31] [ 430.146674][ T31] dump_stack_lvl+0x189/0x250 [ 430.146701][ T31] ? __wake_up_klogd+0xd9/0x110 [ 430.146725][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.146750][ T31] ? __pfx__printk+0x10/0x10 [ 430.146790][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 430.146822][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 430.146848][ T31] ? _printk+0xcf/0x120 [ 430.146880][ T31] ? __pfx__printk+0x10/0x10 [ 430.146910][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 430.146942][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 430.146973][ T31] watchdog+0xfee/0x1030 [ 430.146997][ T31] ? watchdog+0x1de/0x1030 [ 430.147038][ T31] kthread+0x70e/0x8a0 [ 430.147066][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.147085][ T31] ? __pfx_kthread+0x10/0x10 [ 430.147104][ T31] ? __pfx_kthread+0x10/0x10 [ 430.147122][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.147139][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.147159][ T31] ? __pfx_kthread+0x10/0x10 [ 430.147177][ T31] ret_from_fork+0x4b/0x80 [ 430.147192][ T31] ? __pfx_kthread+0x10/0x10 [ 430.147211][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.147250][ T31] [ 430.147257][ T31] Sending NMI from CPU 1 to CPUs 0: [ 430.294295][ C0] NMI backtrace for cpu 0 [ 430.294317][ C0] CPU: 0 UID: 0 PID: 5840 Comm: syz-executor421 Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT(full) [ 430.294338][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 [ 430.294348][ C0] RIP: 0010:dtSplitRoot+0x793/0x16c0 [ 430.294375][ C0] Code: b6 f5 bf ff 00 00 00 e8 5b e9 86 fe 40 84 ed 78 33 e8 51 e6 86 fe 48 c1 e5 05 4c 01 ed 49 89 ed 49 c1 ed 03 43 0f b6 44 25 00 <84> c0 75 2b 44 0f b6 75 00 45 84 f6 78 34 e8 2a e6 86 fe 4c 8b 6c [ 430.294389][ C0] RSP: 0018:ffffc9000435f6c8 EFLAGS: 00000a06 [ 430.294404][ C0] RAX: 0000000000000000 RBX: 0000000000000004 RCX: ffff88807c6dda00 [ 430.294415][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000ff [ 430.294425][ C0] RBP: ffff888023737000 R08: 00000000000001ff R09: 0000000000000000 [ 430.294435][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 430.294446][ C0] R13: 1ffff110046e6e00 R14: 0000000000000000 R15: 1ffff110046e6e02 [ 430.294457][ C0] FS: 0000555567eb7380(0000) GS:ffff8881260fd000(0000) knlGS:0000000000000000 [ 430.294471][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 430.294483][ C0] CR2: 000055744e166600 CR3: 00000000791e6000 CR4: 00000000003526f0 [ 430.294497][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 430.294506][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 430.294516][ C0] Call Trace: [ 430.294524][ C0] [ 430.294549][ C0] dtInsert+0xef8/0x5f40 [ 430.294579][ C0] ? txLockAlloc+0x239/0x380 [ 430.294596][ C0] ? __pfx_txLockAlloc+0x10/0x10 [ 430.294617][ C0] ? do_raw_spin_unlock+0x122/0x240 [ 430.294635][ C0] ? __pfx_dtInsert+0x10/0x10 [ 430.294655][ C0] ? txLock+0xfe0/0x1cb0 [ 430.294674][ C0] ? __pfx_txLock+0x10/0x10 [ 430.294699][ C0] jfs_create+0x6c8/0xa80 [ 430.294728][ C0] ? __pfx_jfs_create+0x10/0x10 [ 430.294765][ C0] ? generic_permission+0x2e5/0x690 [ 430.294786][ C0] ? bpf_lsm_inode_create+0x9/0x20 [ 430.294804][ C0] vfs_create+0x24b/0x400 [ 430.294826][ C0] do_mknodat+0x3c6/0x4d0 [ 430.294845][ C0] ? __pfx_do_mknodat+0x10/0x10 [ 430.294863][ C0] ? getname_flags+0x1e5/0x540 [ 430.294880][ C0] __x64_sys_mknod+0x8c/0xa0 [ 430.294901][ C0] do_syscall_64+0xf6/0x210 [ 430.294921][ C0] ? clear_bhb_loop+0x45/0xa0 [ 430.294940][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 430.294956][ C0] RIP: 0033:0x7f84be817a99 [ 430.294984][ C0] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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 [ 430.294997][ C0] RSP: 002b:00007fff593cc308 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 [ 430.295012][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f84be817a99 [ 430.295023][ C0] RDX: 0000000000000701 RSI: 0000000000000408 RDI: 0000200000000000 [ 430.295039][ C0] RBP: 00007f84be8915f0 R08: 00000000000061c0 R09: 0000555567eb84c0 [ 430.295050][ C0] R10: 00007fff593cc1d0 R11: 0000000000000246 R12: 00007fff593cc330 [ 430.295061][ C0] R13: 00007fff593cc558 R14: 431bde82d7b634db R15: 00007f84be86003b [ 430.295081][ C0] [ 430.295341][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 430.610090][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT(full) [ 430.621889][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 [ 430.631949][ T31] Call Trace: [ 430.635241][ T31] [ 430.638207][ T31] dump_stack_lvl+0x99/0x250 [ 430.642841][ T31] ? __asan_memcpy+0x40/0x70 [ 430.647454][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.652665][ T31] ? __pfx__printk+0x10/0x10 [ 430.657277][ T31] panic+0x2db/0x790 [ 430.661191][ T31] ? __pfx_panic+0x10/0x10 [ 430.665616][ T31] ? nmi_backtrace_stall_check+0x433/0x440 [ 430.671431][ T31] ? preempt_schedule_thunk+0x16/0x30 [ 430.676827][ T31] ? nmi_trigger_cpumask_backtrace+0x2b6/0x300 [ 430.682999][ T31] watchdog+0x102d/0x1030 [ 430.687350][ T31] ? watchdog+0x1de/0x1030 [ 430.691772][ T31] kthread+0x70e/0x8a0 [ 430.695844][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.700526][ T31] ? __pfx_kthread+0x10/0x10 [ 430.705122][ T31] ? __pfx_kthread+0x10/0x10 [ 430.709718][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.714918][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.720121][ T31] ? __pfx_kthread+0x10/0x10 [ 430.724714][ T31] ret_from_fork+0x4b/0x80 [ 430.729136][ T31] ? __pfx_kthread+0x10/0x10 [ 430.733725][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.738508][ T31] [ 430.741886][ T31] Kernel Offset: disabled [ 430.746226][ T31] Rebooting in 86400 seconds..