./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor238507364
<...>
Warning: Permanently added '10.128.1.1' (ECDSA) to the list of known hosts.
execve("./syz-executor238507364", ["./syz-executor238507364"], 0x7ffec152bd90 /* 10 vars */) = 0
brk(NULL) = 0x55555588c000
brk(0x55555588cc40) = 0x55555588cc40
arch_prctl(ARCH_SET_FS, 0x55555588c300) = 0
uname({sysname="Linux", nodename="syzkaller", ...}) = 0
readlink("/proc/self/exe", "/root/syz-executor238507364", 4096) = 27
brk(0x5555558adc40) = 0x5555558adc40
brk(0x5555558ae000) = 0x5555558ae000
mprotect(0x7f01596f1000, 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
openat(AT_FDCWD, "io.stat", O_RDWR|O_CREAT|O_NOCTTY|O_TRUNC|O_APPEND|FASYNC|0x18, 000) = 3
ioctl(3, FS_IOC_SETFLAGS, [FS_JOURNAL_DATA_FL]) = 0
openat(AT_FDCWD, "cgroup.controllers", O_RDWR|O_CREAT|O_NOCTTY|O_TRUNC|O_APPEND|FASYNC|0x18, 000) = 4
syzkaller login: [ 54.063256][ T5079]
[ 54.065624][ T5079] ======================================================
[ 54.072623][ T5079] WARNING: possible circular locking dependency detected
[ 54.079628][ T5079] 6.2.0-syzkaller-12886-g37d9df224d1e #0 Not tainted
[ 54.086290][ T5079] ------------------------------------------------------
[ 54.093286][ T5079] syz-executor238/5079 is trying to acquire lock:
[ 54.099674][ T5079] ffff888144ff0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_bmap+0x52/0x470
[ 54.109247][ T5079]
[ 54.109247][ T5079] but task is already holding lock:
[ 54.116598][ T5079] ffff88814afe83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x47f/0xc90
[ 54.127183][ T5079]
[ 54.127183][ T5079] which lock already depends on the new lock.
[ 54.127183][ T5079]
[ 54.137572][ T5079]
[ 54.137572][ T5079] the existing dependency chain (in reverse order) is:
[ 54.146563][ T5079]
[ 54.146563][ T5079] -> #3 (&journal->j_checkpoint_mutex){+.+.}-{3:3}:
[ 54.155316][ T5079] mutex_lock_io_nested+0x143/0x11a0
[ 54.161113][ T5079] jbd2_journal_flush+0x19e/0xc90
[ 54.166643][ T5079] __ext4_ioctl+0xb3f/0x4c90
[ 54.171753][ T5079] __x64_sys_ioctl+0x197/0x210
[ 54.177033][ T5079] do_syscall_64+0x39/0xb0
[ 54.181955][ T5079] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 54.188357][ T5079]
[ 54.188357][ T5079] -> #2 (&journal->j_barrier){+.+.}-{3:3}:
[ 54.196323][ T5079] __mutex_lock+0x12f/0x1350
[ 54.201420][ T5079] jbd2_journal_lock_updates+0x162/0x310
[ 54.207562][ T5079] ext4_change_inode_journal_flag+0x188/0x550
[ 54.214138][ T5079] ext4_fileattr_set+0xe78/0x1a50
[ 54.219669][ T5079] vfs_fileattr_set+0x7ff/0xc40
[ 54.225029][ T5079] do_vfs_ioctl+0xfa8/0x1670
[ 54.230149][ T5079] __x64_sys_ioctl+0x10c/0x210
[ 54.235427][ T5079] do_syscall_64+0x39/0xb0
[ 54.240352][ T5079] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 54.246758][ T5079]
[ 54.246758][ T5079] -> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}:
[ 54.255161][ T5079] percpu_down_write+0x53/0x390
[ 54.260520][ T5079] ext4_ind_migrate+0x23b/0x860
[ 54.265878][ T5079] ext4_fileattr_set+0x1582/0x1a50
[ 54.273323][ T5079] vfs_fileattr_set+0x7ff/0xc40
[ 54.278682][ T5079] do_vfs_ioctl+0xfa8/0x1670
[ 54.283779][ T5079] __x64_sys_ioctl+0x10c/0x210
[ 54.289049][ T5079] do_syscall_64+0x39/0xb0
[ 54.293967][ T5079] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 54.300368][ T5079]
[ 54.300368][ T5079] -> #0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}:
[ 54.308945][ T5079] __lock_acquire+0x2ec7/0x5d40
[ 54.314298][ T5079] lock_acquire+0x1e3/0x670
[ 54.319301][ T5079] down_read+0x3d/0x50
[ 54.323876][ T5079] ext4_bmap+0x52/0x470
[ 54.328549][ T5079] bmap+0xae/0x120
[ 54.332804][ T5079] jbd2_journal_bmap+0xac/0x1c0
[ 54.338170][ T5079] jbd2_journal_flush+0x87b/0xc90
[ 54.343713][ T5079] __ext4_ioctl+0xb3f/0x4c90
[ 54.348814][ T5079] __x64_sys_ioctl+0x197/0x210
[ 54.354085][ T5079] do_syscall_64+0x39/0xb0
[ 54.359005][ T5079] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 54.365404][ T5079]
[ 54.365404][ T5079] other info that might help us debug this:
[ 54.365404][ T5079]
[ 54.375609][ T5079] Chain exists of:
[ 54.375609][ T5079] &sb->s_type->i_mutex_key#8 --> &journal->j_barrier --> &journal->j_checkpoint_mutex
[ 54.375609][ T5079]
[ 54.391052][ T5079] Possible unsafe locking scenario:
[ 54.391052][ T5079]
[ 54.398479][ T5079] CPU0 CPU1
[ 54.403818][ T5079] ---- ----
[ 54.409183][ T5079] lock(&journal->j_checkpoint_mutex);
[ 54.414709][ T5079] lock(&journal->j_barrier);
[ 54.421968][ T5079] lock(&journal->j_checkpoint_mutex);
[ 54.430007][ T5079] lock(&sb->s_type->i_mutex_key#8);
[ 54.435455][ T5079]
[ 54.435455][ T5079] *** DEADLOCK ***
[ 54.435455][ T5079]
[ 54.443580][ T5079] 2 locks held by syz-executor238/5079:
[ 54.449100][ T5079] #0: ffff88814afe8170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310
[ 54.459960][ T5079] #1: ffff88814afe83f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x47f/0xc90
[ 54.470986][ T5079]
[ 54.470986][ T5079] stack backtrace:
[ 54.476853][ T5079] CPU: 1 PID: 5079 Comm: syz-executor238 Not tainted 6.2.0-syzkaller-12886-g37d9df224d1e #0
[ 54.486894][ T5079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
[ 54.496934][ T5079] Call Trace:
[ 54.500201][ T5079] <TASK>
[ 54.503114][ T5079] dump_stack_lvl+0xd9/0x150
[ 54.507693][ T5079] check_noncircular+0x25f/0x2e0
[ 54.512616][ T5079] ? print_circular_bug+0x5c0/0x5c0
[ 54.517796][ T5079] ? __switch_to+0x5d0/0x1110
[ 54.522458][ T5079] ? mark_lock.part.0+0xee/0x1970
[ 54.527466][ T5079] ? print_usage_bug.part.0+0x660/0x660
[ 54.533000][ T5079] __lock_acquire+0x2ec7/0x5d40
[ 54.537833][ T5079] ? __wait_on_bit+0xd4/0x180
[ 54.542497][ T5079] ? lockdep_hardirqs_on_prepare+0x410/0x410
[ 54.548470][ T5079] lock_acquire+0x1e3/0x670
[ 54.552966][ T5079] ? ext4_bmap+0x52/0x470
[ 54.557281][ T5079] ? out_of_line_wait_on_bit_timeout+0x170/0x170
[ 54.563595][ T5079] ? lock_release+0x780/0x780
[ 54.568255][ T5079] down_read+0x3d/0x50
[ 54.572310][ T5079] ? ext4_bmap+0x52/0x470
[ 54.576634][ T5079] ext4_bmap+0x52/0x470
[ 54.580786][ T5079] ? mpage_release_unused_pages+0x870/0x870
[ 54.586663][ T5079] bmap+0xae/0x120
[ 54.590369][ T5079] ? do_raw_read_unlock+0xe0/0xe0
[ 54.595379][ T5079] jbd2_journal_bmap+0xac/0x1c0
[ 54.600214][ T5079] ? jbd2_log_start_commit+0x50/0x50
[ 54.605481][ T5079] ? _raw_write_unlock+0x28/0x40
[ 54.610417][ T5079] ? jbd2_mark_journal_empty+0x307/0x3f0
[ 54.616034][ T5079] jbd2_journal_flush+0x87b/0xc90
[ 54.621043][ T5079] ? apparmor_capable+0x1dc/0x460
[ 54.626053][ T5079] ? jbd2_fc_get_buf+0x310/0x310
[ 54.630990][ T5079] ? bpf_lsm_capable+0x9/0x10
[ 54.635659][ T5079] ? security_capable+0x93/0xc0
[ 54.640495][ T5079] __ext4_ioctl+0xb3f/0x4c90
[ 54.645079][ T5079] ? tomoyo_path_number_perm+0x166/0x570
[ 54.650700][ T5079] ? ext4_reset_inode_seed+0x450/0x450
[ 54.656324][ T5079] ? __sanitizer_cov_trace_switch+0x54/0x90
[ 54.662203][ T5079] ? do_vfs_ioctl+0x132/0x1670
[ 54.666957][ T5079] ? vfs_fileattr_set+0xc40/0xc40
[ 54.671969][ T5079] ? find_held_lock+0x2d/0x110
[ 54.676716][ T5079] ? put_page+0x2/0x280
[ 54.680874][ T5079] ? ext4_fileattr_set+0x1a50/0x1a50
[ 54.686147][ T5079] __x64_sys_ioctl+0x197/0x210
[ 54.690900][ T5079] do_syscall_64+0x39/0xb0
[ 54.695302][ T5079] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 54.701184][ T5079] RIP: 0033:0x7f0159684b79
[ 54.705581][ T5079] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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
[ 54.725168][ T5079] RSP: 002b:00007fffa4586f58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 54.733561][ T5079] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0159684b79
[ 54.741521][ T5079] RDX: 0000000020000700 RSI: 000000004004662b RDI: 0000000000000004
[ 54.749478][ T5079] RBP: 00007f0159648d20 R08: 0000000000000000 R09: 0000000000000000
[ 54.757543][ T5079] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0159648db0
ioctl(4, _IOC(_IOC_WRITE, 0x66, 0x2b, 0x4), 0x20000700) = 0
exit_group(0) = ?
+++ exited with 0 +++
[ 54.76