./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3972619774 <...> Warning: Permanently added '10.128.0.37' (ED25519) to the list of known hosts. execve("./syz-executor3972619774", ["./syz-executor3972619774"], 0x7ffc1df4e590 /* 10 vars */) = 0 brk(NULL) = 0x555557353000 brk(0x555557353d00) = 0x555557353d00 arch_prctl(ARCH_SET_FS, 0x555557353380) = 0 set_tid_address(0x555557353650) = 5833 set_robust_list(0x555557353660, 24) = 0 rseq(0x555557353ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3972619774", 4096) = 28 getrandom("\x09\x61\x78\xab\x17\xf3\x84\xce", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555557353d00 brk(0x555557374d00) = 0x555557374d00 brk(0x555557375000) = 0x555557375000 mprotect(0x7f80b57b4000, 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 5835 attached [pid 5835] set_robust_list(0x555557353660, 24) = 0 [pid 5833] <... clone resumed>, child_tidptr=0x555557353650) = 5835 [pid 5835] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5835] setpgid(0, 0) = 0 [pid 5835] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5835] write(3, "1000", 4) = 4 [pid 5835] close(3) = 0 executing program [pid 5835] write(1, "executing program\n", 18) = 18 [pid 5835] memfd_create("syzkaller", 0) = 3 [pid 5835] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f80ad200000 [pid 5835] 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 5835] munmap(0x7f80ad200000, 138412032) = 0 [pid 5835] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5835] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5835] close(3) = 0 [pid 5835] close(4) = 0 [pid 5835] mkdir("./bus", 0777) = 0 [pid 5835] mount("/dev/loop0", "./bus", "jfs", 0, "") = 0 [pid 5835] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 3 [pid 5835] chdir("./bus") = 0 [pid 5835] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [ 149.262010][ T5835] loop0: detected capacity change from 0 to 32768 [pid 5835] mknod("./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 000 [pid 5833] kill(-5835, SIGKILL) = 0 [pid 5833] kill(5835, SIGKILL) = 0 [pid 5833] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5833] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5833] getdents64(3, 0x5555573546f0 /* 2 entries */, 32768) = 48 [pid 5833] getdents64(3, 0x5555573546f0 /* 0 entries */, 32768) = 0 [pid 5833] close(3) = 0 [ 429.636120][ T31] INFO: task kworker/u8:0:12 blocked for more than 143 seconds. [ 429.643885][ T31] Not tainted 6.15.0-rc4-syzkaller-00319-g14c55b7bb0a8 #0 [ 429.653280][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 429.662283][ T31] task:kworker/u8:0 state:D stack:22456 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00004000 [ 429.674588][ T31] Workqueue: writeback wb_workfn (flush-7:0) [ 429.680913][ T31] Call Trace: [ 429.684214][ T31] [ 429.687498][ T31] __schedule+0x168f/0x4c70 [ 429.692041][ T31] ? blk_mq_flush_plug_list+0x163a/0x1760 [ 429.698182][ T31] ? __pfx_blk_mq_flush_plug_list+0x10/0x10 [ 429.704117][ T31] ? schedule+0x165/0x360 [ 429.708877][ T31] ? __pfx___schedule+0x10/0x10 [ 429.713771][ T31] ? schedule+0x91/0x360 [ 429.718625][ T31] schedule+0x165/0x360 [ 429.722837][ T31] schedule_preempt_disabled+0x13/0x30 [ 429.728703][ T31] __mutex_lock+0x724/0xe80 [ 429.733261][ T31] ? __mutex_lock+0x51b/0xe80 [ 429.738311][ T31] ? jfs_commit_inode+0x1ca/0x530 [ 429.743373][ T31] ? __pfx___mutex_lock+0x10/0x10 [ 429.748778][ T31] ? inode_to_bdi+0x69/0xf0 [ 429.753331][ T31] jfs_commit_inode+0x1ca/0x530 [ 429.759241][ T31] ? __pfx_jfs_commit_inode+0x10/0x10 [ 429.764712][ T31] jfs_write_inode+0x145/0x220 [ 429.769991][ T31] __writeback_single_inode+0x6ee/0xff0 [ 429.775593][ T31] writeback_sb_inodes+0x6b5/0x1000 [ 429.781215][ T31] ? __pfx_writeback_sb_inodes+0x10/0x10 [ 429.787167][ T31] ? __pfx___up_read+0x10/0x10 [ 429.791990][ T31] __writeback_inodes_wb+0x111/0x240 [ 429.797721][ T31] wb_writeback+0x44f/0xaf0 [ 429.802265][ T31] ? queue_io+0x301/0x590 [ 429.806948][ T31] ? __pfx_wb_writeback+0x10/0x10 [ 429.812022][ T31] wb_workfn+0xaef/0xef0 [ 429.816940][ T31] ? __pfx_wb_workfn+0x10/0x10 [ 429.821739][ T31] ? register_lock_class+0x51/0x320 [ 429.827422][ T31] ? __lock_acquire+0xaac/0xd20 [ 429.832315][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.838514][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 429.843741][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.849852][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.855628][ T31] process_scheduled_works+0xadb/0x17a0 [ 429.861614][ T31] ? __pfx_process_scheduled_works+0x10/0x10 [ 429.868108][ T31] worker_thread+0x8a0/0xda0 [ 429.872764][ T31] kthread+0x70e/0x8a0 [ 429.877503][ T31] ? __pfx_worker_thread+0x10/0x10 [ 429.882654][ T31] ? __pfx_kthread+0x10/0x10 [ 429.887711][ T31] ? __pfx_kthread+0x10/0x10 [ 429.892330][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 429.897999][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 429.903320][ T31] ? __pfx_kthread+0x10/0x10 [ 429.908255][ T31] ret_from_fork+0x4b/0x80 [ 429.912707][ T31] ? __pfx_kthread+0x10/0x10 [ 429.917699][ T31] ret_from_fork_asm+0x1a/0x30 [ 429.922516][ T31] [ 429.926061][ T31] [ 429.926061][ T31] Showing all locks held in the system: [ 429.933806][ T31] 4 locks held by kworker/u8:0/12: [ 429.939560][ T31] #0: ffff88801c6f1148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 [ 429.951111][ T31] #1: ffffc90000117c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 [ 429.963876][ T31] #2: ffff8880331ae0e0 (&type->s_umount_key#43){.+.+}-{4:4}, at: super_trylock_shared+0x20/0xf0 [ 429.974753][ T31] #3: ffff888073499438 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 [ 429.985448][ T31] 1 lock held by khungtaskd/31: [ 429.990742][ T31] #0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 430.001169][ T31] 2 locks held by getty/5568: [ 430.005864][ T31] #0: ffff888033cba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 430.015899][ T31] #1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 430.026520][ T31] 4 locks held by syz-executor397/5835: [ 430.032081][ T31] [ 430.034417][ T31] ============================================= [ 430.034417][ T31] [ 430.043531][ T31] NMI backtrace for cpu 0 [ 430.043554][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-00319-g14c55b7bb0a8 #0 PREEMPT(full) [ 430.043579][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 [ 430.043593][ T31] Call Trace: [ 430.043599][ T31] [ 430.043607][ T31] dump_stack_lvl+0x189/0x250 [ 430.043655][ T31] ? __wake_up_klogd+0xd9/0x110 [ 430.043680][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.043707][ T31] ? __pfx__printk+0x10/0x10 [ 430.043750][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 430.043784][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 430.043811][ T31] ? _printk+0xcf/0x120 [ 430.043845][ T31] ? __pfx__printk+0x10/0x10 [ 430.043877][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 430.043911][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 430.043944][ T31] watchdog+0xfee/0x1030 [ 430.043970][ T31] ? watchdog+0x1de/0x1030 [ 430.044000][ T31] kthread+0x70e/0x8a0 [ 430.044025][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.044047][ T31] ? __pfx_kthread+0x10/0x10 [ 430.044069][ T31] ? __pfx_kthread+0x10/0x10 [ 430.044089][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.044108][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.044130][ T31] ? __pfx_kthread+0x10/0x10 [ 430.044150][ T31] ret_from_fork+0x4b/0x80 [ 430.044167][ T31] ? __pfx_kthread+0x10/0x10 [ 430.044188][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.044233][ T31] [ 430.044240][ T31] Sending NMI from CPU 0 to CPUs 1: [ 430.191521][ C1] NMI backtrace for cpu 1 [ 430.191539][ C1] CPU: 1 UID: 0 PID: 5835 Comm: syz-executor397 Not tainted 6.15.0-rc4-syzkaller-00319-g14c55b7bb0a8 #0 PREEMPT(full) [ 430.191558][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 [ 430.191573][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 [ 430.191594][ C1] Code: 8b 3d ec d4 d5 0b 48 89 de 5b e9 f3 3c 55 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 30 72 92 65 8b 15 b8 60 b2 10 81 e2 00 01 ff 00 [ 430.191607][ C1] RSP: 0018:ffffc900040ef6c0 EFLAGS: 00000246 [ 430.191621][ C1] RAX: ffffffff8338e90f RBX: 0000000000000004 RCX: 0000000000000000 [ 430.191631][ C1] RDX: ffff88802716da00 RSI: 0000000000000000 RDI: 00000000000000ff [ 430.191640][ C1] RBP: 0000000000000000 R08: 0000000200000000 R09: 0000000000000000 [ 430.191649][ C1] R10: 0030000000000000 R11: 000007ff00000020 R12: dffffc0000000000 [ 430.191660][ C1] R13: ffff8880739ec000 R14: 0000000000000000 R15: 1ffff1100e73d802 [ 430.191671][ C1] FS: 0000555557353380(0000) GS:ffff8881261fd000(0000) knlGS:0000000000000000 [ 430.191683][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 430.191693][ C1] CR2: 0000564fe9ca4600 CR3: 0000000074d7c000 CR4: 00000000003526f0 [ 430.191707][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 430.191715][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 430.191724][ C1] Call Trace: [ 430.191730][ C1] [ 430.191736][ C1] dtSplitRoot+0x77f/0x16c0 [ 430.191772][ C1] dtInsert+0xef8/0x5f40 [ 430.191798][ C1] ? txLockAlloc+0x239/0x380 [ 430.191813][ C1] ? __pfx_txLockAlloc+0x10/0x10 [ 430.191831][ C1] ? do_raw_spin_unlock+0x122/0x240 [ 430.191847][ C1] ? __pfx_dtInsert+0x10/0x10 [ 430.191865][ C1] ? txLock+0xfe0/0x1cb0 [ 430.191883][ C1] ? __pfx_txLock+0x10/0x10 [ 430.191905][ C1] jfs_create+0x6c8/0xa80 [ 430.191930][ C1] ? __pfx_jfs_create+0x10/0x10 [ 430.191964][ C1] ? generic_permission+0x2e5/0x690 [ 430.191983][ C1] ? bpf_lsm_inode_create+0x9/0x20 [ 430.191999][ C1] vfs_create+0x24b/0x400 [ 430.192019][ C1] do_mknodat+0x3c6/0x4d0 [ 430.192036][ C1] ? __pfx_do_mknodat+0x10/0x10 [ 430.192052][ C1] ? getname_flags+0x1e5/0x540 [ 430.192067][ C1] __x64_sys_mknod+0x8c/0xa0 [ 430.192086][ C1] do_syscall_64+0xf6/0x210 [ 430.192104][ C1] ? clear_bhb_loop+0x45/0xa0 [ 430.192121][ C1] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 430.192135][ C1] RIP: 0033:0x7f80b573aa99 [ 430.192160][ 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 [ 430.192171][ C1] RSP: 002b:00007ffe094f4668 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 [ 430.192186][ C1] RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f80b573aa99 [ 430.192196][ C1] RDX: 0000000000000701 RSI: 0000000000000000 RDI: 0000200000000000 [ 430.192205][ C1] RBP: 00007f80b57b45f0 R08: 00000000000061c0 R09: 00005555573544c0 [ 430.192233][ C1] R10: 00007ffe094f4530 R11: 0000000000000246 R12: 00007ffe094f4690 [ 430.192243][ C1] R13: 00007ffe094f48b8 R14: 431bde82d7b634db R15: 00007f80b578303b [ 430.192263][ C1] [ 430.192530][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 430.512660][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-00319-g14c55b7bb0a8 #0 PREEMPT(full) [ 430.524478][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 [ 430.534534][ T31] Call Trace: [ 430.537817][ T31] [ 430.540745][ T31] dump_stack_lvl+0x99/0x250 [ 430.545342][ T31] ? __asan_memcpy+0x40/0x70 [ 430.549932][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.555143][ T31] ? __pfx__printk+0x10/0x10 [ 430.559746][ T31] panic+0x2db/0x790 [ 430.563649][ T31] ? __pfx_panic+0x10/0x10 [ 430.568073][ T31] ? nmi_backtrace_stall_check+0x433/0x440 [ 430.573885][ T31] ? preempt_schedule_thunk+0x16/0x30 [ 430.579266][ T31] ? nmi_trigger_cpumask_backtrace+0x2b6/0x300 [ 430.585441][ T31] watchdog+0x102d/0x1030 [ 430.589781][ T31] ? watchdog+0x1de/0x1030 [ 430.594224][ T31] kthread+0x70e/0x8a0 [ 430.598324][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.603018][ T31] ? __pfx_kthread+0x10/0x10 [ 430.607612][ T31] ? __pfx_kthread+0x10/0x10 [ 430.612246][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.617445][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.622653][ T31] ? __pfx_kthread+0x10/0x10 [ 430.627246][ T31] ret_from_fork+0x4b/0x80 [ 430.631663][ T31] ? __pfx_kthread+0x10/0x10 [ 430.636252][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.641033][ T31] [ 430.644388][ T31] Kernel Offset: disabled [ 430.648718][ T31] Rebooting in 86400 seconds..