./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1192354144 <...> Warning: Permanently added '10.128.0.119' (ED25519) to the list of known hosts. execve("./syz-executor1192354144", ["./syz-executor1192354144"], 0x7fff83a803e0 /* 10 vars */) = 0 brk(NULL) = 0x55558c5e2000 brk(0x55558c5e2d00) = 0x55558c5e2d00 arch_prctl(ARCH_SET_FS, 0x55558c5e2380) = 0 set_tid_address(0x55558c5e2650) = 5834 set_robust_list(0x55558c5e2660, 24) = 0 rseq(0x55558c5e2ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1192354144", 4096) = 28 getrandom("\xa2\x73\xbe\x20\xae\x7f\x45\xb6", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558c5e2d00 brk(0x55558c603d00) = 0x55558c603d00 brk(0x55558c604000) = 0x55558c604000 mprotect(0x7f1e6f0ac000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5835 attached [pid 5835] set_robust_list(0x55558c5e2660, 24 [pid 5834] <... clone resumed>, child_tidptr=0x55558c5e2650) = 5835 [pid 5835] <... set_robust_list resumed>) = 0 [pid 5834] openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "10000000000", 11) = 11 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/hung_task_check_interval_secs", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "20", 2) = 2 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_kallsyms", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_harden", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "0", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/kptr_restrict", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "0", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "100", 3) = 3 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "0", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "0", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "7 4 1 3", 7) = 7 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "0", 1) = 1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "5835", 4) = 4 [pid 5834] close(3) = 0 [pid 5834] kill(5835, SIGKILL) = 0 [pid 5835] +++ killed by SIGKILL +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=5835, si_uid=0, si_status=SIGKILL, si_utime=0, si_stime=0} --- 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 5836 attached [pid 5836] set_robust_list(0x55558c5e2660, 24) = 0 [pid 5836] prctl(PR_SET_PDEATHSIG, SIGKILL [pid 5834] <... clone resumed>, child_tidptr=0x55558c5e2650) = 5836 [pid 5836] <... prctl resumed>) = 0 [pid 5836] setpgid(0, 0) = 0 [pid 5836] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5836] write(3, "1000", 4) = 4 [pid 5836] close(3) = 0 executing program [pid 5836] write(1, "executing program\n", 18) = 18 [pid 5836] memfd_create("syzkaller", 0) = 3 [pid 5836] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1e66a00000 [pid 5836] 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 5836] munmap(0x7f1e66a00000, 138412032) = 0 [pid 5836] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5836] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5836] close(3) = 0 [pid 5836] close(4) = 0 [pid 5836] mkdir("./file0", 0777) = 0 [ 172.958756][ T5836] loop0: detected capacity change from 0 to 32768 [ 173.033441][ T5836] bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,background_compression=lz4,nojournal_transaction_names,version_upgrade=none [ 173.033441][ T5836] allowing incompatible features above 0.0: (unknown version) [ 173.060796][ T5836] bcachefs (loop0): recovering from clean shutdown, journal seq 13 [ 173.082551][ T5836] bcachefs (loop0): accounting_read... done [ 173.089430][ T5836] bcachefs (loop0): alloc_read... done [ 173.095055][ T5836] bcachefs (loop0): snapshots_read... done [ 173.103542][ T5836] bcachefs (loop0): going read-write [ 173.113058][ T5836] bcachefs (loop0): journal_replay... done [ 173.118952][ T5836] bcachefs (loop0): resume_logged_ops... done [ 173.125773][ T5836] bcachefs (loop0): delete_dead_inodes... done [ 173.132521][ T5846] bcachefs (loop0): backpointer doesn't match extent it points to: [ 173.132540][ T5846] u64s 9 type backpointer 0:8921088:0 len 0 ver 0: bucket=0:34:8 btree=extents level=0 data_type=user suboffset=0 len=8 gen=0 pos=1073741825:24:U32_MAX [ 173.132555][ T5846] u64s 8 type extent 1073741825:24:U32_MAX len 24 ver 2: durability: 1 crc: c_size 8 size 24 offset 0 nonce 0 csum chacha20_poly1305_80 5c1d:75853c64f7009f9d compress lz4 ptr: 0:34:8 gen 0 [pid 5836] mount("/dev/loop0", "./file0", "bcachefs", 0, "version_upgrade=none,background_compression=lz4,") = 0 [pid 5836] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5836] chdir("./file0") = 0 [pid 5836] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5836] ioctl(4, LOOP_CLR_FD) = 0 [pid 5836] close(4) = 0 [ 173.132571][ T5846] u64s 9 type backpointer 0:8921088:0 len 0 ver 0: bucket=0:34:8 btree=extents level=0 data_type=user suboffset=0 len=8 gen=0 pos=1073741825:24:U32_MAX, fixing [ 173.191630][ T5836] bcachefs (loop0): done starting filesystem [pid 5836] openat(AT_FDCWD, "./file1", O_WRONLY|O_CREAT|O_SYNC|O_NOATIME|FASYNC, 000) = 4 [pid 5836] pwritev2(4, [{iov_base="\x00", iov_len=1}], 1, 20093, 0 [pid 5834] kill(-5836, SIGKILL) = 0 [pid 5834] kill(5836, SIGKILL) = 0 [pid 5834] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5834] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5834] getdents64(3, 0x55558c5e36f0 /* 2 entries */, 32768) = 48 [pid 5834] getdents64(3, 0x55558c5e36f0 /* 0 entries */, 32768) = 0 [pid 5834] close(3) = 0 [ 204.450225][ T5836] Allocator stuck? Waited for 30 seconds [ 204.450252][ T5836] Allocator debug: [ 204.450262][ T5836] capacity1536 [ 204.450278][ T5836] reserved 31232 [ 204.450287][ T5836] hidden 0 [ 204.450296][ T5836] btree 0 [ 204.450305][ T5836] data 0 [ 204.450314][ T5836] cached 0 [ 204.450324][ T5836] reserved 0 [ 204.450333][ T5836] online_reserved 8 [ 204.450342][ T5836] nr_inodes 0 [ 204.450351][ T5836] [ 204.450359][ T5836] freelist_wait waiting [ 204.450368][ T5836] open buckets allocated1 [ 204.450377][ T5836] open buckets total 1024 [ 204.450386][ T5836] open_buckets_wait empty [ 204.450395][ T5836] open_buckets_btree 0 [ 204.450404][ T5836] open_buckets_user 0 [ 204.450413][ T5836] btree reserve cache 0 [ 204.450422][ T5836] [ 204.450430][ T5836] Dev 0: [ 204.450438][ T5836] buckets sectors fragmented [ 204.450449][ T5836] free 0 0 0 [ 204.450460][ T5836] sb 0 0 0 [ 204.450471][ T5836] journal 0 0 0 [ 204.450481][ T5836] btree 0 0 0 [ 204.450492][ T5836] user 0 0 0 [ 204.450503][ T5836] cached 0 0 0 [ 204.450514][ T5836] parity 0 0 0 [ 204.450525][ T5836] stripe 0 0 0 [ 204.450535][ T5836] need_gc_gens 0 0 0 [ 204.450546][ T5836] need_discard 0 0 0 [ 204.450557][ T5836] unstriped 0 0 0 [ 204.450568][ T5836] capacity 128 [ 204.450577][ T5836] [ 204.450585][ T5836] reserves: [ 204.450593][ T5836] stripe 60 [ 204.450602][ T5836] normal 58 [ 204.450611][ T5836] copygc 56 [ 204.450620][ T5836] btree 28 [ 204.450629][ T5836] btree_copygc 0 [ 204.450639][ T5836] reclaim 0 [ 204.450648][ T5836] interior_updates 0 [ 204.450657][ T5836] [ 204.450664][ T5836] open buckets 0 [ 204.450674][ T5836] buckets to invalidate 0 [ 204.450683][ T5836] [ 204.450691][ T5836] Copygc debug: [ 204.450699][ T5836] running: 1 [ 204.450707][ T5836] copygc_wait:0 [ 204.450716][ T5836] copygc_wait_at:0 [ 204.450724][ T5836] Currently waiting for:0 B [ 204.450733][ T5836] Currently waiting since:640 KiB [ 204.450743][ T5836] Currently calculated wait:0 B [ 204.450752][ T5836] [ 204.450760][ T5836] Journal debug: [ 204.450768][ T5836] flags: replay_done,running,may_skip_flush [ 204.450779][ T5836] dirty journal entries: 1/32768 [ 204.450788][ T5836] seq: 15 [ 204.450798][ T5836] seq_ondisk: 14 [ 204.450807][ T5836] last_seq: 15 [ 204.450816][ T5836] last_seq_ondisk: 14 [ 204.450825][ T5836] flushed_seq_ondisk: 14 [ 204.450834][ T5836] watermark: stripe [ 204.450844][ T5836] each entry reserved: 321 [ 204.450853][ T5836] nr flush writes: 1 [ 204.450863][ T5836] nr noflush writes: 0 [ 204.450872][ T5836] average write size: 1.27 KiB [ 204.450881][ T5836] free buf: 0 [ 204.450890][ T5836] nr direct reclaim: 0 [ 204.450899][ T5836] nr background reclaim: 3 [ 204.450909][ T5836] reclaim kicked: 0 [ 204.450918][ T5836] reclaim runs in: 10 ms [ 204.450927][ T5836] blocked: 0 [ 204.450936][ T5836] current entry sectors: 256 [ 204.450945][ T5836] current entry error: (No error) [ 204.450955][ T5836] current entry: 31/7864 [ 204.450965][ T5836] unwritten entries: [ 204.450973][ T5836] seq: 15 [ 204.450983][ T5836] refcount: 1 [ 204.450992][ T5836] io: 0x0 r 0 [ 204.451001][ T5836] size: 56.0 B [ 204.451011][ T5836] expires: 3 jiffies [ 204.451020][ T5836] flags: need_flush_to_write_buffer [ 204.451031][ T5836] last buf open [ 204.451039][ T5836] space: [ 204.451047][ T5836] discarded 256:1536 [ 204.451057][ T5836] clean ondisk 256:1536 [ 204.451066][ T5836] clean 256:1536 [ 204.451076][ T5836] total 256:2048 [ 204.451085][ T5836] dev 0: [ 204.451094][ T5836] durability 1: [ 204.451102][ T5836] nr 8 [ 204.451111][ T5836] bucket size 256 [ 204.451120][ T5836] available 6:248 [ 204.451130][ T5836] discard_idx 0 [ 204.451139][ T5836] dirty_ondisk 0 (seq 14) [ 204.451148][ T5836] dirty_idx 0 (seq 14) [ 204.451158][ T5836] cur_idx 0 (seq 14) [ 204.451168][ T5836] replicas want 1 need 1 [ 356.119404][ T31] INFO: task syz-executor119:5836 blocked for more than 143 seconds. [ 356.127548][ T31] Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 [ 356.136120][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 356.145196][ T31] task:syz-executor119 state:D stack:21192 pid:5836 tgid:5836 ppid:5834 task_flags:0x440140 flags:0x00004006 [ 356.157464][ T31] Call Trace: [ 356.161106][ T31] [ 356.164087][ T31] __schedule+0x168f/0x4c70 [ 356.168658][ T31] ? blk_mq_flush_plug_list+0x10e/0x1760 [ 356.175365][ T31] ? __pfx_blk_mq_flush_plug_list+0x10/0x10 [ 356.181607][ T31] ? schedule+0x165/0x360 [ 356.186010][ T31] ? __pfx___schedule+0x10/0x10 [ 356.191291][ T31] ? schedule+0x91/0x360 [ 356.195574][ T31] schedule+0x165/0x360 [ 356.200190][ T31] ? __closure_sync+0x113/0x220 [ 356.205084][ T31] __closure_sync+0x163/0x220 [ 356.210235][ T31] ? __pfx___closure_sync+0x10/0x10 [ 356.215483][ T31] ? __bch2_wait_on_allocator+0x1c7/0x240 [ 356.221700][ T31] __bch2_write+0x324b/0x39b0 [ 356.226437][ T31] ? __lock_acquire+0xaac/0xd20 [ 356.231765][ T31] ? filemap_get_folios_tag+0x53b/0x630 [ 356.237358][ T31] ? __pfx_filemap_get_folios_tag+0x10/0x10 [ 356.243773][ T31] ? __pfx___bch2_write+0x10/0x10 [ 356.248850][ T31] ? mlock_drain_local+0x79/0x490 [ 356.254371][ T31] ? mlock_drain_local+0x79/0x490 [ 356.260117][ T31] ? mlock_drain_local+0x28e/0x490 [ 356.265283][ T31] ? bch2_write+0x7d7/0x11e0 [ 356.270175][ T31] ? write_cache_pages+0xc1/0x100 [ 356.275241][ T31] bch2_writepages+0x269/0x360 [ 356.280897][ T31] ? check_path+0x21/0x40 [ 356.285271][ T31] ? __pfx_bch2_writepages+0x10/0x10 [ 356.290971][ T31] ? lockdep_unlock+0x89/0x120 [ 356.295782][ T31] ? __pfx_bch2_writepages+0x10/0x10 [ 356.301546][ T31] do_writepages+0x3ae/0x7b0 [ 356.306184][ T31] ? do_raw_spin_lock+0x121/0x290 [ 356.311723][ T31] ? __pfx_do_writepages+0x10/0x10 [ 356.316877][ T31] ? do_raw_spin_unlock+0x122/0x240 [ 356.322555][ T31] file_write_and_wait_range+0x22c/0x330 [ 356.328229][ T31] ? __pfx_file_write_and_wait_range+0x10/0x10 [ 356.334961][ T31] bch2_fsync+0x127/0x330 [ 356.339681][ T31] bch2_write_iter+0x2822/0x2b90 [ 356.344702][ T31] ? __pfx_bch2_write_iter+0x10/0x10 [ 356.350478][ T31] do_iter_readv_writev+0x56b/0x7f0 [ 356.355729][ T31] ? __pfx_do_iter_readv_writev+0x10/0x10 [ 356.361964][ T31] ? rcu_read_lock_any_held+0xb3/0x120 [ 356.367487][ T31] vfs_writev+0x306/0x9a0 [ 356.372284][ T31] ? __pfx_vfs_writev+0x10/0x10 [ 356.377189][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 356.382881][ T31] ? _raw_spin_unlock_irq+0x2e/0x50 [ 356.388151][ T31] ? ptrace_notify+0x22d/0x2c0 [ 356.393807][ T31] __se_sys_pwritev2+0x179/0x290 [ 356.398794][ T31] ? __pfx___se_sys_pwritev2+0x10/0x10 [ 356.404748][ T31] ? __x64_sys_pwritev2+0x20/0xc0 [ 356.410090][ T31] do_syscall_64+0xf6/0x210 [ 356.414640][ T31] ? clear_bhb_loop+0x45/0xa0 [ 356.419790][ T31] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 356.425718][ T31] RIP: 0033:0x7f1e6f028e49 [ 356.430538][ T31] RSP: 002b:00007ffc16033868 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 [ 356.439021][ T31] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f1e6f028e49 [ 356.447481][ T31] RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000004 [ 356.455782][ T31] RBP: 00000000000016cb R08: 0000000000000008 R09: 0000000000000000 [ 356.464121][ T31] R10: 0000000000004e7d R11: 0000000000000246 R12: 00007ffc160338c0 [ 356.472404][ T31] R13: 00007ffc160339a0 R14: 431bde82d7b634db R15: 00007f1e6f07201d [ 356.480760][ T31] [ 356.483881][ T31] [ 356.483881][ T31] Showing all locks held in the system: [ 356.492138][ T31] 1 lock held by khungtaskd/31: [ 356.497008][ T31] #0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 356.507773][ T31] 2 locks held by getty/5575: [ 356.513194][ T31] #0: ffff888030a940a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 356.523343][ T31] #1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 356.533808][ T31] 1 lock held by syz-executor119/5836: [ 356.539577][ T31] #0: ffff88806c8a2420 (sb_writers#9){.+.+}-{0:0}, at: vfs_writev+0x274/0x9a0 [ 356.548639][ T31] 2 locks held by bch-copygc/loop/5846: [ 356.554770][ T31] [ 356.557133][ T31] ============================================= [ 356.557133][ T31] [ 356.566187][ T31] NMI backtrace for cpu 0 [ 356.566213][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full) [ 356.566241][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 [ 356.566252][ T31] Call Trace: [ 356.566259][ T31] [ 356.566266][ T31] dump_stack_lvl+0x189/0x250 [ 356.566294][ T31] ? __wake_up_klogd+0xd9/0x110 [ 356.566317][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 356.566340][ T31] ? __pfx__printk+0x10/0x10 [ 356.566380][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 356.566408][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 356.566430][ T31] ? _printk+0xcf/0x120 [ 356.566462][ T31] ? __pfx__printk+0x10/0x10 [ 356.566491][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 356.566521][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 356.566549][ T31] watchdog+0xfee/0x1030 [ 356.566572][ T31] ? watchdog+0x1de/0x1030 [ 356.566600][ T31] kthread+0x70e/0x8a0 [ 356.566622][ T31] ? __pfx_watchdog+0x10/0x10 [ 356.566642][ T31] ? __pfx_kthread+0x10/0x10 [ 356.566662][ T31] ? __pfx_kthread+0x10/0x10 [ 356.566680][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 356.566706][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 356.566734][ T31] ? __pfx_kthread+0x10/0x10 [ 356.566752][ T31] ret_from_fork+0x4b/0x80 [ 356.566767][ T31] ? __pfx_kthread+0x10/0x10 [ 356.566786][ T31] ret_from_fork_asm+0x1a/0x30 [ 356.566826][ T31] [ 356.566833][ T31] Sending NMI from CPU 0 to CPUs 1: [ 356.714020][ C1] NMI backtrace for cpu 1 [ 356.714037][ C1] CPU: 1 UID: 0 PID: 5846 Comm: bch-copygc/loop Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full) [ 356.714058][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 [ 356.714068][ C1] RIP: 0010:do_raw_spin_lock+0x0/0x290 [ 356.714091][ C1] Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 7c 90 48 89 df e8 05 df 80 00 eb 86 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 [ 356.714105][ C1] RSP: 0018:ffffc900042ef3b8 EFLAGS: 00000096 [ 356.714120][ C1] RAX: 38baba9dc830c300 RBX: ffff88807604ed20 RCX: 38baba9dc830c300 [ 356.714133][ C1] RDX: 0000000000000000 RSI: ffffffff8d91f812 RDI: ffff88807604ed20 [ 356.714144][ C1] RBP: ffffc900042ef448 R08: 0000000000000000 R09: 0000000000080000 [ 356.714155][ C1] R10: 0000000000000000 R11: ffffffff844b2735 R12: dffffc0000000000 [ 356.714167][ C1] R13: 000000000000000d R14: 0000000000000a06 R15: 1ffff9200085de78 [ 356.714178][ C1] FS: 0000000000000000(0000) GS:ffff888126202000(0000) knlGS:0000000000000000 [ 356.714202][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 356.714212][ C1] CR2: 00007ffcdbbf52e8 CR3: 000000000dd36000 CR4: 00000000003526f0 [ 356.714226][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 356.714235][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 356.714251][ C1] Call Trace: [ 356.714257][ C1] [ 356.714262][ C1] _raw_spin_lock_irqsave+0xb3/0xf0 [ 356.714289][ C1] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 356.714317][ C1] __bch2_time_stats_update+0x55/0x390 [ 356.714346][ C1] bch2_trans_begin+0x7bf/0x1f10 [ 356.714373][ C1] ? __pfx_bch2_trans_begin+0x10/0x10 [ 356.714388][ C1] ? __bch2_darray_resize_noprof+0x1c9/0x290 [ 356.714406][ C1] ? rcu_is_watching+0x15/0xb0 [ 356.714429][ C1] ? __bch2_darray_resize_noprof+0x1c9/0x290 [ 356.714446][ C1] ? bch2_btree_iter_advance+0x346/0x7d0 [ 356.714479][ C1] bch2_copygc+0x50b/0x3cf0 [ 356.714498][ C1] ? bch2_copygc+0x3c0/0x3cf0 [ 356.714529][ C1] ? __pfx_bch2_copygc+0x10/0x10 [ 356.714545][ C1] ? bch2_copygc_wait_amount+0xdc/0xbb0 [ 356.714563][ C1] ? bch2_copygc_wait_amount+0xb4e/0xbb0 [ 356.714581][ C1] ? bch2_copygc_wait_amount+0xdc/0xbb0 [ 356.714603][ C1] ? bch2_copygc+0x3c0/0x3cf0 [ 356.714630][ C1] ? bch2_copygc+0x3c0/0x3cf0 [ 356.714654][ C1] bch2_copygc_thread+0x8c9/0xd40 [ 356.714672][ C1] ? bch2_copygc_thread+0x17b/0xd40 [ 356.714698][ C1] ? __pfx_bch2_copygc_thread+0x10/0x10 [ 356.714716][ C1] ? bch2_copygc_thread+0x3dd/0xd40 [ 356.714752][ C1] ? _raw_spin_unlock_irqrestore+0x85/0x110 [ 356.714774][ C1] ? lockdep_hardirqs_on+0x9c/0x150 [ 356.714803][ C1] ? __kthread_parkme+0x7b/0x200 [ 356.714826][ C1] ? __kthread_parkme+0x1a1/0x200 [ 356.714851][ C1] kthread+0x70e/0x8a0 [ 356.714868][ C1] ? __pfx_bch2_copygc_thread+0x10/0x10 [ 356.714885][ C1] ? __pfx_kthread+0x10/0x10 [ 356.714901][ C1] ? __pfx_kthread+0x10/0x10 [ 356.714916][ C1] ? _raw_spin_unlock_irq+0x23/0x50 [ 356.714936][ C1] ? lockdep_hardirqs_on+0x9c/0x150 [ 356.714959][ C1] ? __pfx_kthread+0x10/0x10 [ 356.714973][ C1] ret_from_fork+0x4b/0x80 [ 356.714987][ C1] ? __pfx_kthread+0x10/0x10 [ 356.715003][ C1] ret_from_fork_asm+0x1a/0x30 [ 356.715032][ C1] [ 356.716168][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 357.047653][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full) [ 357.059454][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 [ 357.069507][ T31] Call Trace: [ 357.072793][ T31] [ 357.075724][ T31] dump_stack_lvl+0x99/0x250 [ 357.080318][ T31] ? __asan_memcpy+0x40/0x70 [ 357.084909][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 357.090133][ T31] ? __pfx__printk+0x10/0x10 [ 357.094738][ T31] panic+0x2db/0x790 [ 357.098631][ T31] ? __pfx_panic+0x10/0x10 [ 357.103047][ T31] ? nmi_backtrace_stall_check+0x433/0x440 [ 357.108860][ T31] ? preempt_schedule_thunk+0x16/0x30 [ 357.114256][ T31] ? nmi_trigger_cpumask_backtrace+0x2b6/0x300 [ 357.120426][ T31] watchdog+0x102d/0x1030 [ 357.124763][ T31] ? watchdog+0x1de/0x1030 [ 357.129192][ T31] kthread+0x70e/0x8a0 [ 357.133267][ T31] ? __pfx_watchdog+0x10/0x10 [ 357.137945][ T31] ? __pfx_kthread+0x10/0x10 [ 357.142532][ T31] ? __pfx_kthread+0x10/0x10 [ 357.147117][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 357.152324][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 357.157535][ T31] ? __pfx_kthread+0x10/0x10 [ 357.162123][ T31] ret_from_fork+0x4b/0x80 [ 357.166541][ T31] ? __pfx_kthread+0x10/0x10 [ 357.171130][ T31] ret_from_fork_asm+0x1a/0x30 [ 357.175911][ T31] [ 357.179317][ T31] Kernel Offset: disabled [ 357.183648][ T31] Rebooting in 86400 seconds..