./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor427798172 <...> Warning: Permanently added '10.128.0.150' (ED25519) to the list of known hosts. execve("./syz-executor427798172", ["./syz-executor427798172"], 0x7ffe088ad040 /* 10 vars */) = 0 brk(NULL) = 0x55556ebb6000 brk(0x55556ebb6d00) = 0x55556ebb6d00 arch_prctl(ARCH_SET_FS, 0x55556ebb6380) = 0 set_tid_address(0x55556ebb6650) = 5861 set_robust_list(0x55556ebb6660, 24) = 0 rseq(0x55556ebb6ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor427798172", 4096) = 27 getrandom("\x9d\x81\x93\xac\x90\xaa\x43\x46", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556ebb6d00 brk(0x55556ebd7d00) = 0x55556ebd7d00 brk(0x55556ebd8000) = 0x55556ebd8000 mprotect(0x7f44ee284000, 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 5862 attached [pid 5862] set_robust_list(0x55556ebb6660, 24) = 0 [pid 5862] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5862] setpgid(0, 0) = 0 [pid 5862] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC [pid 5861] <... clone resumed>, child_tidptr=0x55556ebb6650) = 5862 [pid 5862] <... openat resumed>) = 3 [pid 5862] write(3, "1000", 4) = 4 [pid 5862] close(3) = 0 executing program [pid 5862] write(1, "executing program\n", 18) = 18 [pid 5862] memfd_create("syzkaller", 0) = 3 [pid 5862] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f44e5c00000 [pid 5862] 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 5862] munmap(0x7f44e5c00000, 138412032) = 0 [pid 5862] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5862] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5862] close(3) = 0 [pid 5862] close(4) = 0 [pid 5862] mkdir("./bus", 0777) = 0 [pid 5862] mount("/dev/loop0", "./bus", "jfs", 0, "") = 0 [pid 5862] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 3 [ 255.569804][ T5862] loop0: detected capacity change from 0 to 32768 [pid 5862] chdir("./bus") = 0 [pid 5862] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5862] symlink("./file0", "./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" [pid 5861] kill(-5862, SIGKILL) = 0 [pid 5861] kill(5862, SIGKILL) = 0 [pid 5861] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5861] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5861] getdents64(3, 0x55556ebb76f0 /* 2 entries */, 32768) = 48 [pid 5861] getdents64(3, 0x55556ebb76f0 /* 0 entries */, 32768) = 0 [pid 5861] close(3) = 0 [ 429.743874][ T31] INFO: task kworker/u8:3:49 blocked for more than 143 seconds. [ 429.751569][ T31] Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 [ 429.759902][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 429.768932][ T31] task:kworker/u8:3 state:D stack:22472 pid:49 tgid:49 ppid:2 task_flags:0x4208060 flags:0x00004000 [ 429.781182][ T31] Workqueue: writeback wb_workfn (flush-7:0) [ 429.787388][ T31] Call Trace: [ 429.790680][ T31] [ 429.793623][ T31] __schedule+0x16a2/0x4cb0 [ 429.798439][ T31] ? blk_mq_flush_plug_list+0x48b/0x550 [ 429.804143][ T31] ? __pfx_blk_mq_flush_plug_list+0x10/0x10 [ 429.810047][ T31] ? schedule+0x165/0x360 [ 429.814607][ T31] ? __pfx___schedule+0x10/0x10 [ 429.819488][ T31] ? schedule+0x91/0x360 [ 429.824016][ T31] schedule+0x165/0x360 [ 429.828196][ T31] schedule_preempt_disabled+0x13/0x30 [ 429.833660][ T31] __mutex_lock+0x724/0xe80 [ 429.838463][ T31] ? __mutex_lock+0x51b/0xe80 [ 429.843159][ T31] ? jfs_commit_inode+0x1ca/0x530 [ 429.848377][ T31] ? __pfx___mutex_lock+0x10/0x10 [ 429.853592][ T31] ? metapage_writepages+0xae/0x100 [ 429.859008][ T31] ? __lock_acquire+0xab9/0xd20 [ 429.864008][ T31] jfs_commit_inode+0x1ca/0x530 [ 429.868875][ T31] ? __pfx_jfs_commit_inode+0x10/0x10 [ 429.874949][ T31] jfs_write_inode+0x145/0x220 [ 429.879738][ T31] __writeback_single_inode+0x6f1/0xff0 [ 429.885548][ T31] writeback_sb_inodes+0x6b5/0x1000 [ 429.890787][ T31] ? __pfx_writeback_sb_inodes+0x10/0x10 [ 429.896666][ T31] ? __pfx___up_read+0x10/0x10 [ 429.901454][ T31] __writeback_inodes_wb+0x111/0x240 [ 429.906979][ T31] wb_writeback+0x44f/0xaf0 [ 429.911500][ T31] ? queue_io+0x301/0x590 [ 429.916044][ T31] ? __pfx_wb_writeback+0x10/0x10 [ 429.921096][ T31] wb_workfn+0xaef/0xef0 [ 429.925557][ T31] ? __pfx_wb_workfn+0x10/0x10 [ 429.930342][ T31] ? __lock_acquire+0xab9/0xd20 [ 429.935415][ T31] ? process_scheduled_works+0x9ef/0x17b0 [ 429.941156][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 429.946597][ T31] ? process_scheduled_works+0x9ef/0x17b0 [ 429.952332][ T31] ? process_scheduled_works+0x9ef/0x17b0 [ 429.958296][ T31] process_scheduled_works+0xade/0x17b0 [ 429.964055][ T31] ? __pfx_process_scheduled_works+0x10/0x10 [ 429.970066][ T31] worker_thread+0x8a0/0xda0 [ 429.974936][ T31] kthread+0x70e/0x8a0 [ 429.979019][ T31] ? __pfx_worker_thread+0x10/0x10 [ 429.984758][ T31] ? __pfx_kthread+0x10/0x10 [ 429.989365][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 429.994780][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.000164][ T31] ? __pfx_kthread+0x10/0x10 [ 430.004945][ T31] ret_from_fork+0x3f9/0x770 [ 430.009553][ T31] ? __pfx_ret_from_fork+0x10/0x10 [ 430.014869][ T31] ? __switch_to_asm+0x39/0x70 [ 430.019638][ T31] ? __switch_to_asm+0x33/0x70 [ 430.024588][ T31] ? __pfx_kthread+0x10/0x10 [ 430.029190][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.034233][ T31] [ 430.037387][ T31] [ 430.037387][ T31] Showing all locks held in the system: [ 430.045369][ T31] 1 lock held by khungtaskd/31: [ 430.050221][ T31] #0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 430.060306][ T31] 4 locks held by kworker/u8:3/49: [ 430.065626][ T31] #0: ffff88801eaea948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 [ 430.077137][ T31] #1: ffffc90000ba7bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 [ 430.089752][ T31] #2: ffff888023f940e0 (&type->s_umount_key#43){.+.+}-{4:4}, at: super_trylock_shared+0x20/0xf0 [ 430.100909][ T31] #3: ffff88807f6dafe0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 [ 430.111395][ T31] 1 lock held by syslogd/5175: [ 430.116393][ T31] #0: ffff8880b873b798 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 [ 430.126501][ T31] 2 locks held by getty/5583: [ 430.131188][ T31] #0: ffff8880357320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 430.141204][ T31] #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 430.151478][ T31] 4 locks held by syz-executor427/5862: [ 430.157183][ T31] [ 430.159515][ T31] ============================================= [ 430.159515][ T31] [ 430.168194][ T31] NMI backtrace for cpu 0 [ 430.168215][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 PREEMPT(full) [ 430.168235][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 430.168245][ T31] Call Trace: [ 430.168252][ T31] [ 430.168258][ T31] dump_stack_lvl+0x189/0x250 [ 430.168283][ T31] ? __wake_up_klogd+0xd9/0x110 [ 430.168304][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.168327][ T31] ? __pfx__printk+0x10/0x10 [ 430.168356][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 430.168380][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 430.168397][ T31] ? _printk+0xcf/0x120 [ 430.168418][ T31] ? __pfx__printk+0x10/0x10 [ 430.168437][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 430.168460][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 430.168483][ T31] watchdog+0xfee/0x1030 [ 430.168512][ T31] ? watchdog+0x1de/0x1030 [ 430.168538][ T31] kthread+0x70e/0x8a0 [ 430.168560][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.168579][ T31] ? __pfx_kthread+0x10/0x10 [ 430.168598][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.168619][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.168640][ T31] ? __pfx_kthread+0x10/0x10 [ 430.168658][ T31] ret_from_fork+0x3f9/0x770 [ 430.168682][ T31] ? __pfx_ret_from_fork+0x10/0x10 [ 430.168708][ T31] ? __switch_to_asm+0x39/0x70 [ 430.168723][ T31] ? __switch_to_asm+0x33/0x70 [ 430.168737][ T31] ? __pfx_kthread+0x10/0x10 [ 430.168755][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.168786][ T31] [ 430.168793][ T31] Sending NMI from CPU 0 to CPUs 1: [ 430.325278][ C1] NMI backtrace for cpu 1 [ 430.325294][ C1] CPU: 1 UID: 0 PID: 5862 Comm: syz-executor427 Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 PREEMPT(full) [ 430.325311][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 430.325320][ C1] RIP: 0010:its_return_thunk+0x0/0x10 [ 430.325341][ C1] Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 8b 35 d1 f5 cc [ 430.325353][ C1] RSP: 0018:ffffc900041ef6a0 EFLAGS: 00000293 [ 430.325366][ C1] RAX: ffffffff833cd6a5 RBX: 0000000000000004 RCX: 0000000000000000 [ 430.325376][ C1] RDX: ffff888030f18000 RSI: 0000000000000000 RDI: 00000000000000ff [ 430.325385][ C1] RBP: 0000000000000000 R08: 00000000000001ff R09: 0000000000000000 [ 430.325394][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 430.325402][ C1] R13: ffff88807b4ef000 R14: 0000000000000000 R15: 1ffff1100f69de02 [ 430.325413][ C1] FS: 000055556ebb6380(0000) GS:ffff888125d85000(0000) knlGS:0000000000000000 [ 430.325425][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 430.325435][ C1] CR2: 00007ffa58a55e80 CR3: 000000007628a000 CR4: 00000000003526f0 [ 430.325448][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 430.325456][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 430.325464][ C1] Call Trace: [ 430.325472][ C1] [ 430.325478][ C1] dtSplitRoot+0x775/0x16c0 [ 430.325516][ C1] dtInsert+0xef8/0x5f40 [ 430.325542][ C1] ? kasan_quarantine_put+0xdd/0x220 [ 430.325557][ C1] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.325582][ C1] ? __pfx_dtInsert+0x10/0x10 [ 430.325599][ C1] ? dtSearch+0x1d29/0x21b0 [ 430.325633][ C1] jfs_symlink+0x715/0xe60 [ 430.325652][ C1] ? __pfx_jfs_symlink+0x10/0x10 [ 430.325664][ C1] ? smk_access+0x14c/0x4e0 [ 430.325691][ C1] ? generic_permission+0x2e5/0x690 [ 430.325714][ C1] ? bpf_lsm_inode_symlink+0x9/0x20 [ 430.325732][ C1] vfs_symlink+0x140/0x2f0 [ 430.325749][ C1] do_symlinkat+0x1b1/0x3f0 [ 430.325766][ C1] ? __pfx_do_symlinkat+0x10/0x10 [ 430.325780][ C1] ? strncpy_from_user+0x150/0x290 [ 430.325798][ C1] ? getname_flags+0x1e5/0x540 [ 430.325817][ C1] __x64_sys_symlink+0x7a/0x90 [ 430.325833][ C1] do_syscall_64+0xfa/0x3b0 [ 430.325853][ C1] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 430.325867][ C1] ? asm_common_interrupt+0x26/0x40 [ 430.325880][ C1] ? clear_bhb_loop+0x60/0xb0 [ 430.325895][ C1] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 430.325909][ C1] RIP: 0033:0x7f44ee20aad9 [ 430.325931][ C1] 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 [ 430.325941][ C1] RSP: 002b:00007ffca95918d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 [ 430.325955][ C1] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f44ee20aad9 [ 430.325966][ C1] RDX: 0000000000000000 RSI: 0000200000000800 RDI: 0000200000000540 [ 430.325975][ C1] RBP: 00007f44ee2845f0 R08: 0000000000006204 R09: 000055556ebb74c0 [ 430.325985][ C1] R10: 00007ffca95917a0 R11: 0000000000000246 R12: 00007ffca9591900 [ 430.325994][ C1] R13: 00007ffca9591b28 R14: 431bde82d7b634db R15: 00007f44ee25303b [ 430.326012][ C1] [ 430.326742][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 430.326760][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 PREEMPT(full) [ 430.326780][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 430.326790][ T31] Call Trace: [ 430.326797][ T31] [ 430.326804][ T31] dump_stack_lvl+0x99/0x250 [ 430.326829][ T31] ? __asan_memcpy+0x40/0x70 [ 430.326846][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.326869][ T31] ? __pfx__printk+0x10/0x10 [ 430.326897][ T31] panic+0x2db/0x790 [ 430.326924][ T31] ? __pfx_panic+0x10/0x10 [ 430.326945][ T31] ? nmi_backtrace_stall_check+0x433/0x440 [ 430.326972][ T31] ? preempt_schedule_thunk+0x16/0x30 [ 430.326992][ T31] ? nmi_trigger_cpumask_backtrace+0x2b6/0x300 [ 430.327020][ T31] watchdog+0x102d/0x1030 [ 430.327044][ T31] ? watchdog+0x1de/0x1030 [ 430.327072][ T31] kthread+0x70e/0x8a0 [ 430.327094][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.327113][ T31] ? __pfx_kthread+0x10/0x10 [ 430.327133][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.327155][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.327176][ T31] ? __pfx_kthread+0x10/0x10 [ 430.327194][ T31] ret_from_fork+0x3f9/0x770 [ 430.327219][ T31] ? __pfx_ret_from_fork+0x10/0x10 [ 430.327245][ T31] ? __switch_to_asm+0x39/0x70 [ 430.327261][ T31] ? __switch_to_asm+0x33/0x70 [ 430.327276][ T31] ? __pfx_kthread+0x10/0x10 [ 430.327295][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.327326][ T31] [ 430.798565][ T31] Kernel Offset: disabled [ 430.802876][ T31] Rebooting in 86400 seconds..