./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor887467980 <...> DUID 00:04:e6:d8:3e:4c:c1:15:84:42:dc:00:60:8c:e3:5f:26:b4 forked to background, child pid 4647 [ 32.047271][ T4648] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.057501][ T4648] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.72' (ECDSA) to the list of known hosts. execve("./syz-executor887467980", ["./syz-executor887467980"], 0x7ffd8d183560 /* 10 vars */) = 0 brk(NULL) = 0x55555702b000 brk(0x55555702bc40) = 0x55555702bc40 arch_prctl(ARCH_SET_FS, 0x55555702b300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor887467980", 4096) = 27 brk(0x55555704cc40) = 0x55555704cc40 brk(0x55555704d000) = 0x55555704d000 mprotect(0x7f98da43d000, 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 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f98d1f84000 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"..., 524288) = 524288 munmap(0x7f98d1f84000, 524288) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./file2", 0777) = 0 mount("/dev/loop0", "./file2", "hfsplus", MS_POSIXACL|MS_LAZYTIME, "") = 0 openat(AT_FDCWD, "./file2", O_RDONLY|O_DIRECTORY) = 3 chdir("./file2") = 0 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 syzkaller login: [ 52.427408][ T5068] loop0: detected capacity change from 0 to 1024 [ 52.448792][ T5068] hfsplus: xattr searching failed [ 52.455077][ T5068] [ 52.457439][ T5068] ============================================ [ 52.463604][ T5068] WARNING: possible recursive locking detected [ 52.469754][ T5068] 6.1.0-syzkaller-13872-gb6bb9676f216 #0 Not tainted [ 52.476412][ T5068] -------------------------------------------- [ 52.482557][ T5068] syz-executor887/5068 is trying to acquire lock: [ 52.488948][ T5068] ffff88807ead9548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x3a3/0x1560 [ 52.499825][ T5068] [ 52.499825][ T5068] but task is already holding lock: [ 52.507181][ T5068] ffff88807eada988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x280/0xbb0 [ 52.518374][ T5068] [ 52.518374][ T5068] other info that might help us debug this: [ 52.526412][ T5068] Possible unsafe locking scenario: [ 52.526412][ T5068] [ 52.533846][ T5068] CPU0 [ 52.537119][ T5068] ---- [ 52.540377][ T5068] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.546173][ T5068] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.551975][ T5068] [ 52.551975][ T5068] *** DEADLOCK *** [ 52.551975][ T5068] [ 52.560206][ T5068] May be due to missing lock nesting notation [ 52.560206][ T5068] [ 52.568503][ T5068] 4 locks held by syz-executor887/5068: [ 52.574044][ T5068] #0: ffff88807d72a460 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 [ 52.583163][ T5068] #1: ffff88807eadab80 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_truncate+0x1ec/0x2f0 [ 52.593577][ T5068] #2: ffff88807eada988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x280/0xbb0 [ 52.605294][ T5068] #3: ffff88807d50c8f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xb6/0x4e0 [ 52.615446][ T5068] [ 52.615446][ T5068] stack backtrace: [ 52.621315][ T5068] CPU: 1 PID: 5068 Comm: syz-executor887 Not tainted 6.1.0-syzkaller-13872-gb6bb9676f216 #0 [ 52.631531][ T5068] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.641660][ T5068] Call Trace: [ 52.644925][ T5068] [ 52.647927][ T5068] dump_stack_lvl+0x1b1/0x290 [ 52.652604][ T5068] ? nf_tcp_handle_invalid+0x630/0x630 [ 52.658392][ T5068] ? panic+0x710/0x710 [ 52.662442][ T5068] ? lockdep_unlock+0x144/0x2e0 [ 52.667387][ T5068] ? print_tainted+0x141/0x160 [ 52.672134][ T5068] ? lockdep_print_held_locks+0x10f/0x1b0 [ 52.678014][ T5068] validate_chain+0x4843/0x6ae0 [ 52.683208][ T5068] ? stack_trace_save+0x104/0x1e0 [ 52.688220][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.693579][ T5068] ? check_noncircular+0x1aa/0x390 [ 52.698678][ T5068] ? add_chain_block+0x850/0x850 [ 52.703597][ T5068] ? lockdep_unlock+0x144/0x2e0 [ 52.708428][ T5068] ? lockdep_lock+0x290/0x290 [ 52.713108][ T5068] ? add_lock_to_list+0x1c7/0x2d0 [ 52.718124][ T5068] ? validate_chain+0x1478/0x6ae0 [ 52.723140][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.728498][ T5068] ? lockdep_unlock+0x144/0x2e0 [ 52.733329][ T5068] ? lockdep_lock+0x290/0x290 [ 52.737986][ T5068] ? add_lock_to_list+0x1c7/0x2d0 [ 52.742993][ T5068] ? validate_chain+0x1478/0x6ae0 [ 52.748029][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.753387][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.758747][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.764104][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.769461][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.774815][ T5068] ? lockdep_unlock+0x144/0x2e0 [ 52.779654][ T5068] ? lockdep_lock+0x290/0x290 [ 52.784309][ T5068] ? add_lock_to_list+0x1c7/0x2d0 [ 52.789315][ T5068] ? validate_chain+0x1478/0x6ae0 [ 52.794330][ T5068] ? validate_chain+0x177/0x6ae0 [ 52.799255][ T5068] ? finish_lock_switch+0x89/0x100 [ 52.804347][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.809790][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.815143][ T5068] ? validate_chain+0x177/0x6ae0 [ 52.820197][ T5068] ? mark_lock+0x9a/0x350 [ 52.824598][ T5068] ? rcu_read_lock_sched_held+0x87/0x110 [ 52.830212][ T5068] ? reacquire_held_locks+0x650/0x650 [ 52.835568][ T5068] ? mark_lock+0x9a/0x350 [ 52.839967][ T5068] ? __lock_acquire+0x1292/0x1f60 [ 52.844973][ T5068] ? rcu_preempt_deferred_qs_irqrestore+0x849/0xc10 [ 52.851558][ T5068] ? lockdep_hardirqs_on_prepare+0x428/0x790 [ 52.858478][ T5068] ? print_irqtrace_events+0x220/0x220 [ 52.863935][ T5068] ? do_raw_spin_unlock+0x134/0x8a0 [ 52.869117][ T5068] ? _raw_spin_unlock_irqrestore+0x8b/0x120 [ 52.875002][ T5068] ? lockdep_hardirqs_on+0x8d/0x130 [ 52.880193][ T5068] ? _raw_spin_unlock_irqrestore+0xc1/0x120 [ 52.886168][ T5068] ? _raw_spin_unlock+0x40/0x40 [ 52.891112][ T5068] ? rcu_preempt_deferred_qs_irqrestore+0x849/0xc10 [ 52.897684][ T5068] ? rcu_read_lock_sched_held+0x87/0x110 [ 52.903387][ T5068] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 52.909525][ T5068] ? stack_trace_save+0x1e0/0x1e0 [ 52.914706][ T5068] ? rcu_read_lock_sched_held+0x87/0x110 [ 52.920321][ T5068] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 52.926380][ T5068] ? rcu_lock_release+0x5/0x20 [ 52.931130][ T5068] ? read_lock_is_recursive+0x10/0x10 [ 52.936482][ T5068] ? rcu_lock_release+0x5/0x20 [ 52.941243][ T5068] ? __lock_acquire+0x1f60/0x1f60 [ 52.946253][ T5068] ? deref_stack_reg+0x17a/0x210 [ 52.951175][ T5068] ? preempt_count_add+0x8d/0x180 [ 52.956185][ T5068] ? register_lock_class+0xc2/0x930 [ 52.961367][ T5068] ? is_bpf_text_address+0x253/0x270 [ 52.966636][ T5068] ? is_dynamic_key+0x1f0/0x1f0 [ 52.971471][ T5068] ? mark_lock+0x9a/0x350 [ 52.975781][ T5068] __lock_acquire+0x1292/0x1f60 [ 52.980616][ T5068] lock_acquire+0x182/0x3c0 [ 52.985187][ T5068] ? hfsplus_get_block+0x3a3/0x1560 [ 52.990371][ T5068] ? read_lock_is_recursive+0x10/0x10 [ 52.995755][ T5068] ? __might_sleep+0xc0/0xc0 [ 53.000413][ T5068] ? register_lock_class+0xc2/0x930 [ 53.005697][ T5068] ? create_page_buffers+0x1c8/0x4b0 [ 53.010968][ T5068] ? block_read_full_folio+0x177/0xfa0 [ 53.016410][ T5068] ? filemap_read_folio+0x187/0x7d0 [ 53.021694][ T5068] ? do_read_cache_folio+0x2d3/0x790 [ 53.026965][ T5068] ? read_cache_page+0x56/0x270 [ 53.031888][ T5068] ? hfsplus_free_extents+0x17f/0xad0 [ 53.037444][ T5068] ? hfsplus_file_truncate+0x827/0xbb0 [ 53.042890][ T5068] ? is_dynamic_key+0x1f0/0x1f0 [ 53.047722][ T5068] ? path_openat+0x272b/0x2dd0 [ 53.052481][ T5068] __mutex_lock_common+0x1bd/0x26e0 [ 53.057669][ T5068] ? hfsplus_get_block+0x3a3/0x1560 [ 53.062850][ T5068] ? __lock_acquire+0x1292/0x1f60 [ 53.067862][ T5068] ? hfsplus_get_block+0x3a3/0x1560 [ 53.073151][ T5068] ? mutex_lock_io_nested+0x60/0x60 [ 53.078420][ T5068] ? rcu_read_lock_sched_held+0x87/0x110 [ 53.084033][ T5068] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 53.089999][ T5068] ? create_page_buffers+0x1c8/0x4b0 [ 53.095441][ T5068] ? trace_lock_release+0x95/0x220 [ 53.100535][ T5068] mutex_lock_nested+0x17/0x20 [ 53.105293][ T5068] hfsplus_get_block+0x3a3/0x1560 [ 53.110307][ T5068] ? __lock_acquire+0x1f60/0x1f60 [ 53.115414][ T5068] ? hfsplus_ext_write_extent+0x1e0/0x1e0 [ 53.121118][ T5068] ? do_raw_spin_unlock+0x134/0x8a0 [ 53.126567][ T5068] ? create_page_buffers+0x244/0x4b0 [ 53.131836][ T5068] block_read_full_folio+0x3b3/0xfa0 [ 53.137204][ T5068] ? hfsplus_ext_write_extent+0x1e0/0x1e0 [ 53.142913][ T5068] ? block_is_partially_uptodate+0x620/0x620 [ 53.148902][ T5068] ? folio_add_lru+0x480/0x960 [ 53.153651][ T5068] filemap_read_folio+0x187/0x7d0 [ 53.158663][ T5068] ? folio_alloc+0x47/0x50 [ 53.163079][ T5068] ? hfsplus_writepage+0x30/0x30 [ 53.168010][ T5068] ? maybe_unlock_mmap_for_io+0x130/0x130 [ 53.173734][ T5068] ? __mutex_lock_common+0x45f/0x26e0 [ 53.179091][ T5068] ? mutex_lock_io_nested+0x60/0x60 [ 53.184269][ T5068] ? __mutex_lock_common+0x45f/0x26e0 [ 53.189745][ T5068] do_read_cache_folio+0x2d3/0x790 [ 53.194856][ T5068] ? hfsplus_writepage+0x30/0x30 [ 53.199781][ T5068] read_cache_page+0x56/0x270 [ 53.204618][ T5068] hfsplus_block_free+0x123/0x4e0 [ 53.209629][ T5068] ? trace_kmalloc+0x30/0xf0 [ 53.214200][ T5068] hfsplus_free_extents+0x17f/0xad0 [ 53.219411][ T5068] hfsplus_file_truncate+0x827/0xbb0 [ 53.224679][ T5068] ? unmap_mapping_range+0xf3/0x2a0 [ 53.229906][ T5068] ? hfsplus_add_extent+0x860/0x860 [ 53.235088][ T5068] ? unmap_mapping_range+0xf3/0x2a0 [ 53.240270][ T5068] ? unmap_mapping_pages+0x190/0x190 [ 53.245536][ T5068] ? current_time+0x1ea/0x300 [ 53.250194][ T5068] ? setattr_prepare+0x1fc/0xc10 [ 53.255117][ T5068] ? truncate_setsize+0xcb/0xf0 [ 53.259949][ T5068] hfsplus_setattr+0x1b8/0x280 [ 53.264695][ T5068] ? hfsplus_fileattr_set+0x330/0x330 [ 53.270069][ T5068] notify_change+0xe50/0x1100 [ 53.274732][ T5068] do_truncate+0x200/0x2f0 [ 53.279258][ T5068] ? put_page_bootmem+0x2d0/0x2d0 [ 53.284285][ T5068] ? ima_bprm_check+0x270/0x270 [ 53.289153][ T5068] path_openat+0x272b/0x2dd0 [ 53.293739][ T5068] ? do_filp_open+0x4f0/0x4f0 [ 53.298585][ T5068] do_filp_open+0x264/0x4f0 [ 53.303081][ T5068] ? vfs_tmpfile+0x490/0x490 [ 53.307670][ T5068] ? do_raw_spin_unlock+0x134/0x8a0 [ 53.312864][ T5068] ? _raw_spin_unlock+0x24/0x40 [ 53.317719][ T5068] ? alloc_fd+0x5a7/0x640 [ 53.322065][ T5068] do_sys_openat2+0x124/0x4e0 [ 53.326743][ T5068] ? do_raw_spin_unlock+0x134/0x8a0 [ 53.331933][ T5068] ? do_sys_open+0x220/0x220 [ 53.336507][ T5068] ? _raw_spin_unlock_irq+0x2a/0x40 [ 53.341697][ T5068] ? ptrace_notify+0x245/0x340 [ 53.346451][ T5068] __x64_sys_creat+0x11f/0x160 [ 53.351199][ T5068] ? __x64_compat_sys_openat+0x290/0x290 [ 53.356828][ T5068] ? syscall_enter_from_user_mode+0x2e/0x1d0 [ 53.362884][ T5068] ? syscall_enter_from_user_mode+0x86/0x1d0 [ 53.368848][ T5068] do_syscall_64+0x3d/0xb0 [ 53.373269][ T5068] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 53.379177][ T5068] RIP: 0033:0x7f98da3d0779 [ 53.383591][ T5068] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48 [ 53.403190][ T5068] RSP: 002b:00007ffec2ada2e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 53.411606][ T5068] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f98da3d0779 [ 53.419588][ T5068] RDX: 00007f98da38edf3 RSI: 0000000000000000 RDI: 00000000200000c0 creat("./file1", 000) = 4 exit_group(0) = ? +++ exited with 0 +++ [ 53.427638][ T5068] RBP: 00007f98da390010 R08: 0000