Extracting prog: 1m58.054869265s
Minimizing prog: 31.53µs
Simplifying prog options: 0s
Extracting C: 34.534404669s
Simplifying C: 8m29.815182737s
extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
detailed listing:
executing program 0:
syz_mount_image$ext4(&(0x7f0000000040)='ext4\x00', &(0x7f0000000000)='./file0\x00', 0x4517, &(0x7f0000000800), 0x12, 0x4b3, &(0x7f0000001b00)="$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")
program crashed: possible deadlock in dquot_commit
single: successfully extracted reproducer
found reproducer with 1 syscalls
minimizing guilty program
extracting C reproducer
testing compiled C program (duration=53.040191854s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program crashed: possible deadlock in dquot_commit
simplifying C reproducer
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program crashed: possible deadlock in dquot_commit
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program did not crash
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program crashed: possible deadlock in dquot_commit
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program crashed: possible deadlock in dquot_commit
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program crashed: possible deadlock in dquot_commit
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program did not crash
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program crashed: possible deadlock in dquot_commit
testing compiled C program (duration=53.040191854s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:true HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$ext4
program crashed: possible deadlock in dquot_commit
reproducing took 11m2.404518571s
repro crashed as (corrupted=false):
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): orphan cleanup on readonly fs
======================================================
WARNING: possible circular locking dependency detected
5.15.178-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor716/4276 is trying to acquire lock:
ffff8880751ce968 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x57/0x510 fs/quota/dquot.c:507
but task is already holding lock:
ffff888075222a58 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&ei->i_data_sem/2){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597
ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869
ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
ext4_quota_read+0x1a1/0x2c0 fs/ext4/super.c:6521
read_blk fs/quota/quota_tree.c:55 [inline]
find_tree_dqentry+0x192/0xb60 fs/quota/quota_tree.c:617
find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635
find_dqentry fs/quota/quota_tree.c:647 [inline]
qtree_read_dquot+0x13f/0x650 fs/quota/quota_tree.c:667
v2_read_dquot+0xbe/0x100 fs/quota/quota_v2.c:333
dquot_acquire+0x188/0x680 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193
dqget+0x762/0xe90 fs/quota/dquot.c:988
__dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1517
ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332
dquot_acquire+0x188/0x680 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193
dqget+0x762/0xe90 fs/quota/dquot.c:988
__dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1517
ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
dquot_commit+0x57/0x510 fs/quota/dquot.c:507
ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
__dquot_free_space+0x932/0xe40 fs/quota/dquot.c:1942
dquot_free_space_nodirty include/linux/quotaops.h:376 [inline]
dquot_free_space include/linux/quotaops.h:381 [inline]
dquot_free_block include/linux/quotaops.h:392 [inline]
ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline]
ext4_free_blocks+0x1f5c/0x2e90 fs/ext4/mballoc.c:6286
ext4_remove_blocks fs/ext4/extents.c:2523 [inline]
ext4_ext_rm_leaf fs/ext4/extents.c:2689 [inline]
ext4_ext_remove_space+0x24da/0x4db0 fs/ext4/extents.c:2937
ext4_ext_truncate+0x191/0x250 fs/ext4/extents.c:4471
ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249
ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289
evict+0x529/0x930 fs/inode.c:622
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Chain exists of:
&dquot->dq_lock --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ei->i_data_sem/2);
lock(&s->s_dquot.dqio_sem);
lock(&ei->i_data_sem/2);
lock(&dquot->dq_lock);
*** DEADLOCK ***
4 locks held by syz-executor716/4276:
#0: ffff88802a8b20e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
#1: ffff88802a8b2650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1813 [inline]
#1: ffff88802a8b2650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1930 [inline]
#1: ffff88802a8b2650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x375/0x1100 fs/ext4/inode.c:243
#2: ffff888075222a58 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244
#3: ffffffff8cc44038 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
stack backtrace:
CPU: 0 PID: 4276 Comm: syz-executor716 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
dquot_commit+0x57/0x510 fs/quota/dquot.c:507
ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
__dquot_free_space+0x932/0xe40 fs/quota/dquot.c:1942
dquot_free_space_nodirty include/linux/quotaops.h:376 [inline]
dquot_free_space include/linux/quotaops.h:381 [inline]
dquot_free_block include/linux/quotaops.h:392 [inline]
ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline]
ext4_free_blocks+0x1f5c/0x2e90 fs/ext4/mballoc.c:6286
ext4_remove_blocks fs/ext4/extents.c:2523 [inline]
ext4_ext_rm_leaf fs/ext4/extents.c:2689 [inline]
ext4_ext_remove_space+0x24da/0x4db0 fs/ext4/extents.c:2937
ext4_ext_truncate+0x191/0x250 fs/ext4/extents.c:4471
ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249
ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289
evict+0x529/0x930 fs/inode.c:622
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f04b29964aa
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
RSP: 002b:00007ffc47e0d228 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f04b29964aa
RDX: 0000400000000040 RSI: 0000400000000000 RDI: 00007ffc47e0d270
RBP: 0000000000000004 R08: 00007ffc47e0d2b0 R09: 00000000000004ad
R10: 0000000000004517 R11: 0000000000000202 R12: 0000000000040000
R13: 00007ffc47e0d2b0 R14: 0000400000000000 R15: 0000000000000003
EXT4-fs (loop0): 1 orphan inode deleted
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.
final repro crashed as (corrupted=false):
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): orphan cleanup on readonly fs
======================================================
WARNING: possible circular locking dependency detected
5.15.178-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor716/4276 is trying to acquire lock:
ffff8880751ce968 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x57/0x510 fs/quota/dquot.c:507
but task is already holding lock:
ffff888075222a58 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&ei->i_data_sem/2){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597
ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869
ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
ext4_quota_read+0x1a1/0x2c0 fs/ext4/super.c:6521
read_blk fs/quota/quota_tree.c:55 [inline]
find_tree_dqentry+0x192/0xb60 fs/quota/quota_tree.c:617
find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635
find_dqentry fs/quota/quota_tree.c:647 [inline]
qtree_read_dquot+0x13f/0x650 fs/quota/quota_tree.c:667
v2_read_dquot+0xbe/0x100 fs/quota/quota_v2.c:333
dquot_acquire+0x188/0x680 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193
dqget+0x762/0xe90 fs/quota/dquot.c:988
__dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1517
ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332
dquot_acquire+0x188/0x680 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193
dqget+0x762/0xe90 fs/quota/dquot.c:988
__dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1517
ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
dquot_commit+0x57/0x510 fs/quota/dquot.c:507
ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
__dquot_free_space+0x932/0xe40 fs/quota/dquot.c:1942
dquot_free_space_nodirty include/linux/quotaops.h:376 [inline]
dquot_free_space include/linux/quotaops.h:381 [inline]
dquot_free_block include/linux/quotaops.h:392 [inline]
ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline]
ext4_free_blocks+0x1f5c/0x2e90 fs/ext4/mballoc.c:6286
ext4_remove_blocks fs/ext4/extents.c:2523 [inline]
ext4_ext_rm_leaf fs/ext4/extents.c:2689 [inline]
ext4_ext_remove_space+0x24da/0x4db0 fs/ext4/extents.c:2937
ext4_ext_truncate+0x191/0x250 fs/ext4/extents.c:4471
ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249
ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289
evict+0x529/0x930 fs/inode.c:622
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Chain exists of:
&dquot->dq_lock --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ei->i_data_sem/2);
lock(&s->s_dquot.dqio_sem);
lock(&ei->i_data_sem/2);
lock(&dquot->dq_lock);
*** DEADLOCK ***
4 locks held by syz-executor716/4276:
#0: ffff88802a8b20e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
#1: ffff88802a8b2650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1813 [inline]
#1: ffff88802a8b2650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1930 [inline]
#1: ffff88802a8b2650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x375/0x1100 fs/ext4/inode.c:243
#2: ffff888075222a58 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244
#3: ffffffff8cc44038 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
stack backtrace:
CPU: 0 PID: 4276 Comm: syz-executor716 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
dquot_commit+0x57/0x510 fs/quota/dquot.c:507
ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
__dquot_free_space+0x932/0xe40 fs/quota/dquot.c:1942
dquot_free_space_nodirty include/linux/quotaops.h:376 [inline]
dquot_free_space include/linux/quotaops.h:381 [inline]
dquot_free_block include/linux/quotaops.h:392 [inline]
ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline]
ext4_free_blocks+0x1f5c/0x2e90 fs/ext4/mballoc.c:6286
ext4_remove_blocks fs/ext4/extents.c:2523 [inline]
ext4_ext_rm_leaf fs/ext4/extents.c:2689 [inline]
ext4_ext_remove_space+0x24da/0x4db0 fs/ext4/extents.c:2937
ext4_ext_truncate+0x191/0x250 fs/ext4/extents.c:4471
ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249
ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289
evict+0x529/0x930 fs/inode.c:622
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f04b29964aa
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
RSP: 002b:00007ffc47e0d228 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f04b29964aa
RDX: 0000400000000040 RSI: 0000400000000000 RDI: 00007ffc47e0d270
RBP: 0000000000000004 R08: 00007ffc47e0d2b0 R09: 00000000000004ad
R10: 0000000000004517 R11: 0000000000000202 R12: 0000000000040000
R13: 00007ffc47e0d2b0 R14: 0000400000000000 R15: 0000000000000003
EXT4-fs (loop0): 1 orphan inode deleted
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.