EXT4-fs error (device loop7): xattr_find_entry:297: inode #15: comm syz.7.1952: corrupted xattr entries
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 1
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.1952/13015 is trying to acquire lock:
ffffffff8c313500 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x2c/0x60 kernel/printk/printk.c:1802

but task is already holding lock:
ffff8880b9039f58 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x595/0xd50 kernel/workqueue.c:-1

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&pool->lock){-.-.}-{2:2}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
       __queue_work+0x595/0xd50 kernel/workqueue.c:-1
       queue_work_on+0x124/0x1f0 kernel/workqueue.c:1559
       serial8250_modem_status+0x196/0x270 drivers/tty/serial/8250/8250_port.c:1855
       serial8250_handle_irq+0x438/0x610 drivers/tty/serial/8250/8250_port.c:1921
       serial8250_default_handle_irq+0xb4/0x1a0 drivers/tty/serial/8250/8250_port.c:1941
       serial8250_interrupt+0x9b/0x1c0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x299/0x9d0 kernel/irq/handle.c:156
       handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
       handle_irq_event+0xa5/0x220 kernel/irq/handle.c:213
       handle_edge_irq+0x243/0xb20 kernel/irq/chip.c:819
       generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
       handle_irq arch/x86/kernel/irq.c:233 [inline]
       __common_interrupt+0xd7/0x1e0 arch/x86/kernel/irq.c:252
       common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:242
       asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:667
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
       _raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
       uart_update_mctrl drivers/tty/serial/serial_core.c:157 [inline]
       uart_tiocmset+0x22e/0x2c0 drivers/tty/serial/serial_core.c:1094
       tty_tiocmset drivers/tty/tty_io.c:2592 [inline]
       tty_ioctl+0x9c8/0xc20 drivers/tty/tty_io.c:2785
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:874 [inline]
       __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
       serial8250_console_write+0x178/0x1000 drivers/tty/serial/8250/8250_port.c:3362
       call_console_drivers kernel/printk/printk.c:-1 [inline]
       console_unlock+0xb9a/0x1120 kernel/printk/printk.c:2744
       vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
       _printk+0xda/0x130 kernel/printk/printk.c:2299
       register_console+0x699/0x980 kernel/printk/printk.c:3107
       univ8250_console_init+0x41/0x50 drivers/tty/serial/8250/8250_core.c:690
       console_init+0x177/0x5d0 kernel/printk/printk.c:3207
       start_kernel+0x2fc/0x540 init/main.c:1090
       secondary_startup_64_no_verify+0xb1/0xbb

-> #0 (console_owner){-.-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3053 [inline]
       check_prevs_add kernel/locking/lockdep.c:3172 [inline]
       validate_chain kernel/locking/lockdep.c:3788 [inline]
       __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012
       lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
       console_lock_spinning_enable+0x51/0x60 kernel/printk/printk.c:1805
       console_unlock+0x8b6/0x1120 kernel/printk/printk.c:2741
       vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
       _printk+0xda/0x130 kernel/printk/printk.c:2299
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail+0x36d/0x4c0 lib/fault-inject.c:146
       prepare_alloc_pages+0x1e4/0x5f0 mm/page_alloc.c:5263
       __alloc_pages+0x11b/0x480 mm/page_alloc.c:5476
       stack_depot_save+0x342/0x440 lib/stackdepot.c:302
       kasan_save_stack+0x4b/0x60 mm/kasan/common.c:40
       kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
       insert_work+0x54/0x3d0 kernel/workqueue.c:1366
       __queue_work+0x9c5/0xd50 kernel/workqueue.c:1532
       mod_delayed_work_on+0xc3/0x1b0 kernel/workqueue.c:1753
       kblockd_mod_delayed_work_on+0x25/0x30 block/blk-core.c:1636
       blk_flush_queue_rq block/blk-flush.c:136 [inline]
       blk_flush_complete_seq+0x6d7/0xc90 block/blk-flush.c:191
       blk_insert_flush+0x330/0x3c0 block/blk-flush.c:442
       blk_mq_submit_bio+0x1325/0x1820 block/blk-mq.c:2265
       __submit_bio+0x7d1/0x820 block/blk-core.c:917
       __submit_bio_noacct_mq block/blk-core.c:997 [inline]
       submit_bio_noacct+0x6b0/0x800 block/blk-core.c:1027
       submit_bio+0x2c1/0x560 block/blk-core.c:1089
       submit_bh fs/buffer.c:3062 [inline]
       __sync_dirty_buffer+0x237/0x370 fs/buffer.c:3157
       ext4_commit_super+0x2fa/0x3f0 fs/ext4/super.c:5546
       ext4_handle_error+0x52e/0x7a0 fs/ext4/super.c:659
       __ext4_error_inode+0x2e8/0x4c0 fs/ext4/super.c:792
       xattr_find_entry fs/ext4/xattr.c:297 [inline]
       ext4_xattr_ibody_get+0x3db/0x690 fs/ext4/xattr.c:601
       ext4_xattr_get+0x115/0x800 fs/ext4/xattr.c:655
       __vfs_getxattr+0x395/0x3d0 fs/xattr.c:401
       cap_inode_need_killpriv+0x41/0x60 security/commoncap.c:301
       security_inode_need_killpriv+0x5e/0x90 security/security.c:1423
       dentry_needs_remove_privs fs/inode.c:1989 [inline]
       file_remove_privs+0x22f/0x5d0 fs/inode.c:2030
       file_modified+0x14/0xa0 fs/inode.c:2099
       ext4_write_checks+0x240/0x2c0 fs/ext4/file.c:247
       ext4_buffered_write_iter+0xb3/0x3b0 fs/ext4/file.c:263
       ext4_file_write_iter+0x74d/0x1700 fs/ext4/file.c:-1
       do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1
       do_iter_write+0x205/0x7b0 fs/read_write.c:855
       vfs_writev fs/read_write.c:928 [inline]
       do_pwritev+0x240/0x3a0 fs/read_write.c:1025
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

other info that might help us debug this:

Chain exists of:
  console_owner --> &port_lock_key --> &pool->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&pool->lock);
                               lock(&port_lock_key);
                               lock(&pool->lock);
  lock(console_owner);

 *** DEADLOCK ***

7 locks held by syz.7.1952/13015:
 #0: ffff8880253a8460 (sb_writers#21){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline]
 #0: ffff8880253a8460 (sb_writers#21){.+.+}-{0:0}, at: do_pwritev+0x229/0x3a0 fs/read_write.c:1025
 #1: ffff888072f383f0 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff888072f383f0 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: ext4_buffered_write_iter+0xa6/0x3b0 fs/ext4/file.c:262
 #2: ffff888072f380c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_get+0xfc/0x800 fs/ext4/xattr.c:654
 #3: ffff888020043b60 (&fq->mq_flush_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:389 [inline]
 #3: ffff888020043b60 (&fq->mq_flush_lock){..-.}-{2:2}, at: blk_insert_flush+0x31e/0x3c0 block/blk-flush.c:441
 #4: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312
 #5: ffff8880b9039f58 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x595/0xd50 kernel/workqueue.c:-1
 #6: ffffffff8c3135e0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0xa7/0x150 kernel/printk/printk.c:2273

stack backtrace:
CPU: 0 PID: 13015 Comm: syz.7.1952 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 check_noncircular+0x296/0x330 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 kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 console_lock_spinning_enable+0x51/0x60 kernel/printk/printk.c:1805
 console_unlock+0x8b6/0x1120 kernel/printk/printk.c:2741
 vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
 _printk+0xda/0x130 kernel/printk/printk.c:2299
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail+0x36d/0x4c0 lib/fault-inject.c:146
 prepare_alloc_pages+0x1e4/0x5f0 mm/page_alloc.c:5263
 __alloc_pages+0x11b/0x480 mm/page_alloc.c:5476
 stack_depot_save+0x342/0x440 lib/stackdepot.c:302
 kasan_save_stack+0x4b/0x60 mm/kasan/common.c:40
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 insert_work+0x54/0x3d0 kernel/workqueue.c:1366
 __queue_work+0x9c5/0xd50 kernel/workqueue.c:1532
 mod_delayed_work_on+0xc3/0x1b0 kernel/workqueue.c:1753
 kblockd_mod_delayed_work_on+0x25/0x30 block/blk-core.c:1636
 blk_flush_queue_rq block/blk-flush.c:136 [inline]
 blk_flush_complete_seq+0x6d7/0xc90 block/blk-flush.c:191
 blk_insert_flush+0x330/0x3c0 block/blk-flush.c:442
 blk_mq_submit_bio+0x1325/0x1820 block/blk-mq.c:2265
 __submit_bio+0x7d1/0x820 block/blk-core.c:917
 __submit_bio_noacct_mq block/blk-core.c:997 [inline]
 submit_bio_noacct+0x6b0/0x800 block/blk-core.c:1027
 submit_bio+0x2c1/0x560 block/blk-core.c:1089
 submit_bh fs/buffer.c:3062 [inline]
 __sync_dirty_buffer+0x237/0x370 fs/buffer.c:3157
 ext4_commit_super+0x2fa/0x3f0 fs/ext4/super.c:5546
 ext4_handle_error+0x52e/0x7a0 fs/ext4/super.c:659
 __ext4_error_inode+0x2e8/0x4c0 fs/ext4/super.c:792
 xattr_find_entry fs/ext4/xattr.c:297 [inline]
 ext4_xattr_ibody_get+0x3db/0x690 fs/ext4/xattr.c:601
 ext4_xattr_get+0x115/0x800 fs/ext4/xattr.c:655
 __vfs_getxattr+0x395/0x3d0 fs/xattr.c:401
 cap_inode_need_killpriv+0x41/0x60 security/commoncap.c:301
 security_inode_need_killpriv+0x5e/0x90 security/security.c:1423
 dentry_needs_remove_privs fs/inode.c:1989 [inline]
 file_remove_privs+0x22f/0x5d0 fs/inode.c:2030
 file_modified+0x14/0xa0 fs/inode.c:2099
 ext4_write_checks+0x240/0x2c0 fs/ext4/file.c:247
 ext4_buffered_write_iter+0xb3/0x3b0 fs/ext4/file.c:263
 ext4_file_write_iter+0x74d/0x1700 fs/ext4/file.c:-1
 do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1
 do_iter_write+0x205/0x7b0 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x240/0x3a0 fs/read_write.c:1025
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fec84b95eb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fec82df1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fec84e10fa0 RCX: 00007fec84b95eb9
RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007fec82df1090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005412 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fec84e11038 R14: 00007fec84e10fa0 R15: 00007ffddc6f7058
 </TASK>
CPU: 0 PID: 13015 Comm: syz.7.1952 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail+0x38c/0x4c0 lib/fault-inject.c:146
 prepare_alloc_pages+0x1e4/0x5f0 mm/page_alloc.c:5263
 __alloc_pages+0x11b/0x480 mm/page_alloc.c:5476
 stack_depot_save+0x342/0x440 lib/stackdepot.c:302
 kasan_save_stack+0x4b/0x60 mm/kasan/common.c:40
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 insert_work+0x54/0x3d0 kernel/workqueue.c:1366
 __queue_work+0x9c5/0xd50 kernel/workqueue.c:1532
 mod_delayed_work_on+0xc3/0x1b0 kernel/workqueue.c:1753
 kblockd_mod_delayed_work_on+0x25/0x30 block/blk-core.c:1636
 blk_flush_queue_rq block/blk-flush.c:136 [inline]
 blk_flush_complete_seq+0x6d7/0xc90 block/blk-flush.c:191
 blk_insert_flush+0x330/0x3c0 block/blk-flush.c:442
 blk_mq_submit_bio+0x1325/0x1820 block/blk-mq.c:2265
 __submit_bio+0x7d1/0x820 block/blk-core.c:917
 __submit_bio_noacct_mq block/blk-core.c:997 [inline]
 submit_bio_noacct+0x6b0/0x800 block/blk-core.c:1027
 submit_bio+0x2c1/0x560 block/blk-core.c:1089
 submit_bh fs/buffer.c:3062 [inline]
 __sync_dirty_buffer+0x237/0x370 fs/buffer.c:3157
 ext4_commit_super+0x2fa/0x3f0 fs/ext4/super.c:5546
 ext4_handle_error+0x52e/0x7a0 fs/ext4/super.c:659
 __ext4_error_inode+0x2e8/0x4c0 fs/ext4/super.c:792
 xattr_find_entry fs/ext4/xattr.c:297 [inline]
 ext4_xattr_ibody_get+0x3db/0x690 fs/ext4/xattr.c:601
 ext4_xattr_get+0x115/0x800 fs/ext4/xattr.c:655
 __vfs_getxattr+0x395/0x3d0 fs/xattr.c:401
 cap_inode_need_killpriv+0x41/0x60 security/commoncap.c:301
 security_inode_need_killpriv+0x5e/0x90 security/security.c:1423
 dentry_needs_remove_privs fs/inode.c:1989 [inline]
 file_remove_privs+0x22f/0x5d0 fs/inode.c:2030
 file_modified+0x14/0xa0 fs/inode.c:2099
 ext4_write_checks+0x240/0x2c0 fs/ext4/file.c:247
 ext4_buffered_write_iter+0xb3/0x3b0 fs/ext4/file.c:263
 ext4_file_write_iter+0x74d/0x1700 fs/ext4/file.c:-1
 do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1
 do_iter_write+0x205/0x7b0 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x240/0x3a0 fs/read_write.c:1025
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fec84b95eb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fec82df1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fec84e10fa0 RCX: 00007fec84b95eb9
RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007fec82df1090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005412 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fec84e11038 R14: 00007fec84e10fa0 R15: 00007ffddc6f7058
 </TASK>
EXT4-fs error (device loop7): get_max_inline_xattr_value_size:68: inode #15: comm syz.7.1952: corrupt xattr in inline inode
EXT4-fs error (device loop7): xattr_find_entry:297: inode #15: comm syz.7.1952: corrupted xattr entries