./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1572450339 <...> Warning: Permanently added '10.128.1.45' (ED25519) to the list of known hosts. execve("./syz-executor1572450339", ["./syz-executor1572450339"], 0x7ffd9e7f7600 /* 10 vars */) = 0 brk(NULL) = 0x55556d21b000 brk(0x55556d21bd00) = 0x55556d21bd00 arch_prctl(ARCH_SET_FS, 0x55556d21b380) = 0 set_tid_address(0x55556d21b650) = 5220 set_robust_list(0x55556d21b660, 24) = 0 rseq(0x55556d21bca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1572450339", 4096) = 28 getrandom("\xc2\xc2\x92\x2a\xc4\x9c\x2d\x0f", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556d21bd00 brk(0x55556d23cd00) = 0x55556d23cd00 brk(0x55556d23d000) = 0x55556d23d000 mprotect(0x7ffbc4fcb000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 executing program 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) = 0x7ffbbca00000 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 munmap(0x7ffbbca00000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 close(4) = 0 mkdir("./file0", 0777) = 0 syzkaller login: [ 79.868993][ T5220] loop0: detected capacity change from 0 to 32768 [ 79.907834][ T5220] bcachefs (/dev/loop0): error reading default superblock: checksum error, type crc32c_nonzero: got ae975d87 should be 29d2fb78 [ 79.993249][ T5220] bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=errors=continue,compression=lz4,nojournal_transaction_names [ 80.008098][ T5220] [ 80.010533][ T5220] ============================================ [ 80.016877][ T5220] WARNING: possible recursive locking detected [ 80.023053][ T5220] 6.12.0-rc1-syzkaller-00042-gf23aa4c0761a #0 Not tainted [ 80.030350][ T5220] -------------------------------------------- [ 80.037049][ T5220] syz-executor157/5220 is trying to acquire lock: [ 80.043589][ T5220] ffff888072d00908 (&c->sb_lock){+.+.}-{3:3}, at: bch2_replicas_entry_validate+0x2a/0x80 [ 80.054274][ T5220] [ 80.054274][ T5220] but task is already holding lock: [ 80.061888][ T5220] ffff888072d00908 (&c->sb_lock){+.+.}-{3:3}, at: bch2_read_superblock_clean+0x36/0x520 [ 80.072154][ T5220] [ 80.072154][ T5220] other info that might help us debug this: [ 80.081207][ T5220] Possible unsafe locking scenario: [ 80.081207][ T5220] [ 80.089701][ T5220] CPU0 [ 80.093097][ T5220] ---- [ 80.096580][ T5220] lock(&c->sb_lock); [ 80.101183][ T5220] lock(&c->sb_lock); [ 80.106153][ T5220] [ 80.106153][ T5220] *** DEADLOCK *** [ 80.106153][ T5220] [ 80.114768][ T5220] May be due to missing lock nesting notation [ 80.114768][ T5220] [ 80.123820][ T5220] 2 locks held by syz-executor157/5220: [ 80.129514][ T5220] #0: ffff888072d00278 (&c->state_lock){+.+.}-{3:3}, at: bch2_fs_start+0x45/0x5b0 [ 80.140043][ T5220] #1: ffff888072d00908 (&c->sb_lock){+.+.}-{3:3}, at: bch2_read_superblock_clean+0x36/0x520 [ 80.150685][ T5220] [ 80.150685][ T5220] stack backtrace: [ 80.156866][ T5220] CPU: 1 UID: 0 PID: 5220 Comm: syz-executor157 Not tainted 6.12.0-rc1-syzkaller-00042-gf23aa4c0761a #0 [ 80.169451][ T5220] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 80.180153][ T5220] Call Trace: [ 80.183477][ T5220] [ 80.186822][ T5220] dump_stack_lvl+0x241/0x360 [ 80.192517][ T5220] ? __pfx_dump_stack_lvl+0x10/0x10 [ 80.198426][ T5220] ? __pfx__printk+0x10/0x10 [ 80.203088][ T5220] ? lockdep_unlock+0x16a/0x300 [ 80.208082][ T5220] print_deadlock_bug+0x483/0x620 [ 80.213417][ T5220] validate_chain+0x15e2/0x5920 [ 80.218741][ T5220] ? __pfx___bfs+0x10/0x10 [ 80.223375][ T5220] ? __pfx_validate_chain+0x10/0x10 [ 80.228729][ T5220] ? mark_lock+0x9a/0x360 [ 80.234405][ T5220] ? __lock_acquire+0x1384/0x2050 [ 80.239689][ T5220] ? mark_lock+0x9a/0x360 [ 80.244257][ T5220] __lock_acquire+0x1384/0x2050 [ 80.249163][ T5220] lock_acquire+0x1ed/0x550 [ 80.254090][ T5220] ? bch2_replicas_entry_validate+0x2a/0x80 [ 80.261125][ T5220] ? __pfx_lock_acquire+0x10/0x10 [ 80.266631][ T5220] ? lockdep_hardirqs_on+0x99/0x150 [ 80.272058][ T5220] ? __pfx___might_resched+0x10/0x10 [ 80.278514][ T5220] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 80.284886][ T5220] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 80.291812][ T5220] ? stack_trace_save+0x118/0x1d0 [ 80.297107][ T5220] __mutex_lock+0x136/0xd70 [ 80.301641][ T5220] ? bch2_replicas_entry_validate+0x2a/0x80 [ 80.307949][ T5220] ? kasan_save_track+0x51/0x80 [ 80.312946][ T5220] ? kasan_save_track+0x3f/0x80 [ 80.318165][ T5220] ? __kasan_kmalloc+0x98/0xb0 [ 80.323359][ T5220] ? __kmalloc_node_track_caller_noprof+0x225/0x440 [ 80.330585][ T5220] ? kmemdup_noprof+0x2a/0x60 [ 80.335965][ T5220] ? bch2_read_superblock_clean+0xd6/0x520 [ 80.342153][ T5220] ? bch2_replicas_entry_validate+0x2a/0x80 [ 80.348354][ T5220] ? bch2_fs_start+0x356/0x5b0 [ 80.353194][ T5220] ? __pfx___mutex_lock+0x10/0x10 [ 80.358269][ T5220] ? do_syscall_64+0xf3/0x230 [ 80.363343][ T5220] bch2_replicas_entry_validate+0x2a/0x80 [ 80.369280][ T5220] journal_entry_data_usage_validate+0x2b6/0x690 [ 80.375760][ T5220] ? __pfx_journal_entry_data_usage_validate+0x10/0x10 [ 80.383367][ T5220] ? journal_entry_usage_validate+0xc2/0x360 [ 80.389387][ T5220] ? __pfx_journal_entry_usage_validate+0x10/0x10 [ 80.396106][ T5220] ? rcu_is_watching+0x15/0xb0 [ 80.401072][ T5220] ? trace_kmalloc+0x1f/0xd0 [ 80.405987][ T5220] ? __kmalloc_node_track_caller_noprof+0x242/0x440 [ 80.413016][ T5220] ? kmemdup_noprof+0x45/0x60 [ 80.418106][ T5220] ? bch2_journal_entry_validate+0x6a/0xf0 [ 80.424163][ T5220] bch2_read_superblock_clean+0x207/0x520 [ 80.429992][ T5220] bch2_fs_recovery+0x1f4/0x39c0 [ 80.434983][ T5220] ? mark_lock+0x9a/0x360 [ 80.439353][ T5220] ? __lock_acquire+0x1384/0x2050 [ 80.444434][ T5220] ? __pfx_bch2_fs_recovery+0x10/0x10 [ 80.449872][ T5220] ? __pfx_lock_release+0x10/0x10 [ 80.454948][ T5220] ? bch2_get_next_online_dev+0x2b/0x4f0 [ 80.460612][ T5220] ? __pfx_lock_release+0x10/0x10 [ 80.465674][ T5220] ? bch2_get_next_online_dev+0x2b/0x4f0 [ 80.471399][ T5220] ? bch2_get_next_online_dev+0x4b9/0x4f0 [ 80.477229][ T5220] ? bch2_get_next_online_dev+0x2b/0x4f0 [ 80.482898][ T5220] ? llist_reverse_order+0x72/0x90 [ 80.488057][ T5220] bch2_fs_start+0x356/0x5b0 [ 80.492683][ T5220] bch2_fs_get_tree+0xd68/0x1710 [ 80.497659][ T5220] ? __pfx_bch2_fs_get_tree+0x10/0x10 [ 80.503310][ T5220] ? generic_parse_monolithic+0x387/0x400 [ 80.509261][ T5220] ? cap_capable+0x1b4/0x250 [ 80.514380][ T5220] ? safesetid_security_capable+0xb2/0x1d0 [ 80.521381][ T5220] vfs_get_tree+0x90/0x2b0 [ 80.526120][ T5220] do_new_mount+0x2be/0xb40 [ 80.530847][ T5220] ? __pfx_do_new_mount+0x10/0x10 [ 80.535906][ T5220] __se_sys_mount+0x2d6/0x3c0 [ 80.540735][ T5220] ? __pfx___se_sys_mount+0x10/0x10 [ 80.546224][ T5220] ? do_syscall_64+0x100/0x230 [ 80.551204][ T5220] ? __x64_sys_mount+0x20/0xc0 [ 80.556073][ T5220] do_syscall_64+0xf3/0x230 [ 80.560598][ T5220] ? clear_bhb_loop+0x35/0x90 [ 80.565818][ T5220] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 80.572277][ T5220] RIP: 0033:0x7ffbc4f53cfa [ 80.576964][ T5220] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 80.599806][ T5220] RSP: 002b:00007ffcafd750a8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 [ 80.608436][ T5220] RAX: ffffffffffffffda RBX: 00007ffcafd750c0 RCX: 00007ffbc4f53cfa [ 80.618268][ T5220] RDX: 0000000020005d80 RSI: 0000000020000000 RDI: 00007ffcafd750c0 [ 80.626391][ T5220] RBP: 0000000000000004 R08: 00007ffcafd75100 R09: 0000000000005d93 [ 80.634473][ T5220] R10: 0000000000000008 R11: 0000000000000282 R12: 0000000000000008 [ 80.642562][ T5220] R13: 00007ffcafd75100 R14: 0000000000000003 R15: 0000000001000000 [ 80.651795][ T5220]