------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc2-next-20231124-syzkaller #0 Not tainted
------------------------------------------------------
udevd/1494 is trying to acquire lock:
ffffffff8cf9a9b8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139

but task is already holding lock:
ffffffff8da73f98 (pool_rwlock){----}-{2:2}, at: stack_depot_put lib/stackdepot.c:621 [inline]
ffffffff8da73f98 (pool_rwlock){----}-{2:2}, at: stack_depot_put+0x24/0x110 lib/stackdepot.c:613

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (pool_rwlock){----}-{2:2}:
       __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
       _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236
       stack_depot_save_flags+0x169/0x740 lib/stackdepot.c:508
       kasan_save_stack+0x42/0x50 mm/kasan/common.c:47
       __kasan_record_aux_stack+0xc2/0xd0 mm/kasan/generic.c:508
       task_work_add+0x88/0x2a0 kernel/task_work.c:48
       task_tick_numa kernel/sched/fair.c:3512 [inline]
       task_tick_fair+0x5a5/0xc30 kernel/sched/fair.c:12599
       scheduler_tick+0x210/0x650 kernel/sched/core.c:5674
       update_process_times+0x19e/0x220 kernel/time/timer.c:2076
       tick_sched_handle+0x8e/0x170 kernel/time/tick-sched.c:255
       tick_nohz_highres_handler+0xe9/0x110 kernel/time/tick-sched.c:1516
       __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
       __hrtimer_run_queues+0x654/0xc20 kernel/time/hrtimer.c:1752
       hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
       local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
       __sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082
       sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
       asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
       __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
       _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
       spin_unlock_irq include/linux/spinlock.h:401 [inline]
       __filemap_add_folio+0x841/0xee0 mm/filemap.c:912
       filemap_add_folio+0xb1/0x1e0 mm/filemap.c:937
       page_cache_ra_unbounded+0x1ce/0x5e0 mm/readahead.c:250
       do_page_cache_ra mm/readahead.c:299 [inline]
       page_cache_ra_order+0x72b/0xa80 mm/readahead.c:546
       ondemand_readahead+0x493/0x1130 mm/readahead.c:668
       page_cache_async_ra mm/readahead.c:717 [inline]
       page_cache_async_ra+0x123/0x150 mm/readahead.c:699
       filemap_readahead mm/filemap.c:2472 [inline]
       filemap_get_pages+0x359/0x1830 mm/filemap.c:2513
       filemap_read+0x39b/0xcf0 mm/filemap.c:2593
       generic_file_read_iter+0x346/0x450 mm/filemap.c:2772
       ext4_file_read_iter+0x1dc/0x6c0 fs/ext4/file.c:147
       __kernel_read+0x300/0x870 fs/read_write.c:428
       integrity_kernel_read+0x7f/0xb0 security/integrity/iint.c:221
       ima_calc_file_hash_tfm+0x2c5/0x3d0 security/integrity/ima/ima_crypto.c:485
       ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
       ima_calc_file_hash+0x1c6/0x4a0 security/integrity/ima/ima_crypto.c:573
       ima_collect_measurement+0x85e/0xa20 security/integrity/ima/ima_api.c:290
       process_measurement+0xe92/0x2260 security/integrity/ima/ima_main.c:359
       ima_file_mmap+0x1ad/0x1d0 security/integrity/ima/ima_main.c:449
       security_mmap_file+0x186/0x1d0 security/security.c:2788
       vm_mmap_pgoff+0xdb/0x3c0 mm/util.c:552
       vm_mmap+0x8e/0xc0 mm/util.c:575
       elf_map fs/binfmt_elf.c:385 [inline]
       elf_load+0x196/0x870 fs/binfmt_elf.c:408
       load_elf_interp fs/binfmt_elf.c:675 [inline]
       load_elf_binary+0x3436/0x4e10 fs/binfmt_elf.c:1200
       search_binary_handler fs/exec.c:1736 [inline]
       exec_binprm fs/exec.c:1778 [inline]
       bprm_execve fs/exec.c:1853 [inline]
       bprm_execve+0x7ef/0x1a80 fs/exec.c:1809
       kernel_execve+0x3d7/0x4e0 fs/exec.c:2021
       try_to_run_init_process init/main.c:1364 [inline]
       kernel_init+0x137/0x2a0 init/main.c:1497
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

-> #2 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
       raw_spin_rq_lock kernel/sched/sched.h:1374 [inline]
       rq_lock kernel/sched/sched.h:1688 [inline]
       task_fork_fair+0x70/0x240 kernel/sched/fair.c:12619
       sched_cgroup_fork+0x3cf/0x510 kernel/sched/core.c:4835
       copy_process+0x6a38/0x9770 kernel/fork.c:2601
       kernel_clone+0xfd/0x940 kernel/fork.c:2899
       user_mode_thread+0xb4/0xf0 kernel/fork.c:2977
       rest_init+0x27/0x2b0 init/main.c:695
       arch_call_rest_init+0x13/0x30 init/main.c:827
       start_kernel+0x39e/0x480 init/main.c:1072
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:555
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:536
       secondary_startup_64_no_verify+0x166/0x16b

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:522 [inline]
       try_to_wake_up+0x9a/0x13d0 kernel/sched/core.c:4252
       up+0x79/0xb0 kernel/locking/semaphore.c:191
       __up_console_sem kernel/printk/printk.c:340 [inline]
       __console_unlock kernel/printk/printk.c:2706 [inline]
       console_unlock+0x1cf/0x260 kernel/printk/printk.c:3038
       con_install+0x161/0x600 drivers/tty/vt/vt.c:3367
       tty_driver_install_tty drivers/tty/tty_io.c:1306 [inline]
       tty_init_dev.part.0+0x99/0x660 drivers/tty/tty_io.c:1418
       tty_init_dev include/linux/err.h:61 [inline]
       tty_open_by_driver drivers/tty/tty_io.c:2084 [inline]
       tty_open+0xb21/0x1010 drivers/tty/tty_io.c:2131
       chrdev_open+0x26d/0x6e0 fs/char_dev.c:414
       do_dentry_open+0x8d6/0x18c0 fs/open.c:949
       do_open fs/namei.c:3634 [inline]
       path_openat+0x1e55/0x2c50 fs/namei.c:3791
       do_filp_open+0x1dc/0x430 fs/namei.c:3821
       do_sys_openat2+0x176/0x1e0 fs/open.c:1441
       do_sys_open fs/open.c:1456 [inline]
       __do_sys_openat fs/open.c:1472 [inline]
       __se_sys_openat fs/open.c:1467 [inline]
       __x64_sys_openat+0x175/0x210 fs/open.c:1467
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
       entry_SYSCALL_64_after_hwframe+0x62/0x6a

-> #0 ((console_sem).lock){-.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3868 [inline]
       __lock_acquire+0x2466/0x3b10 kernel/locking/lockdep.c:5136
       lock_acquire kernel/locking/lockdep.c:5753 [inline]
       lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
       down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
       console_trylock+0x73/0x130 kernel/printk/printk.c:2659
       console_trylock_spinning kernel/printk/printk.c:1923 [inline]
       vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
       vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2328
       __warn_printk+0x158/0x350 kernel/panic.c:721
       refcount_warn_saturate+0x149/0x210 lib/refcount.c:28
       __refcount_sub_and_test include/linux/refcount.h:283 [inline]
       __refcount_dec_and_test include/linux/refcount.h:315 [inline]
       refcount_dec_and_test include/linux/refcount.h:333 [inline]
       stack_depot_put lib/stackdepot.c:627 [inline]
       stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
       qlink_free mm/kasan/quarantine.c:159 [inline]
       qlist_free_all+0x16d/0x1e0 mm/kasan/quarantine.c:201
       kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:308
       __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:307
       kasan_slab_alloc include/linux/kasan.h:188 [inline]
       slab_post_alloc_hook mm/slab.h:763 [inline]
       slab_alloc_node mm/slub.c:3452 [inline]
       slab_alloc mm/slub.c:3460 [inline]
       __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
       kmem_cache_alloc+0x163/0x300 mm/slub.c:3476
       getname_flags.part.0+0x50/0x4e0 fs/namei.c:140
       getname_flags+0x9b/0xf0 include/linux/audit.h:321
       user_path_at_empty+0x2c/0x60 fs/namei.c:2922
       user_path_at include/linux/namei.h:57 [inline]
       do_faccessat+0x13c/0xb40 fs/open.c:484
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
       entry_SYSCALL_64_after_hwframe+0x62/0x6a

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->__lock --> pool_rwlock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(pool_rwlock);
                               lock(&rq->__lock);
                               lock(pool_rwlock);
  lock((console_sem).lock);

 *** DEADLOCK ***

2 locks held by udevd/1494:
 #0: ffffffff8d1463f0 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline]
 #0: ffffffff8d1463f0 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline]
 #0: ffffffff8d1463f0 (remove_cache_srcu){.+.+}-{0:0}, at: kasan_quarantine_reduce+0x81/0x1d0 mm/kasan/quarantine.c:281
 #1: ffffffff8da73f98 (pool_rwlock){----}-{2:2}, at: stack_depot_put lib/stackdepot.c:621 [inline]
 #1: ffffffff8da73f98 (pool_rwlock){----}-{2:2}, at: stack_depot_put+0x24/0x110 lib/stackdepot.c:613

stack backtrace:
CPU: 0 PID: 1494 Comm: udevd Not tainted 6.7.0-rc2-next-20231124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_noncircular+0x316/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3868 [inline]
 __lock_acquire+0x2466/0x3b10 kernel/locking/lockdep.c:5136
 lock_acquire kernel/locking/lockdep.c:5753 [inline]
 lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
 console_trylock+0x73/0x130 kernel/printk/printk.c:2659
 console_trylock_spinning kernel/printk/printk.c:1923 [inline]
 vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
 vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2328
 __warn_printk+0x158/0x350 kernel/panic.c:721
 refcount_warn_saturate+0x149/0x210 lib/refcount.c:28
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 stack_depot_put lib/stackdepot.c:627 [inline]
 stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
 qlink_free mm/kasan/quarantine.c:159 [inline]
 qlist_free_all+0x16d/0x1e0 mm/kasan/quarantine.c:201
 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:308
 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:307
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook mm/slab.h:763 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x163/0x300 mm/slub.c:3476
 getname_flags.part.0+0x50/0x4e0 fs/namei.c:140
 getname_flags+0x9b/0xf0 include/linux/audit.h:321
 user_path_at_empty+0x2c/0x60 fs/namei.c:2922
 user_path_at include/linux/namei.h:57 [inline]
 do_faccessat+0x13c/0xb40 fs/open.c:484
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fdb74316da6
Code: 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 41 55 41 89 ca 41 89 d5 b8 b7 01 00 00 41 54 41 89 cc 55 53 48 81 ec 98 00 00 00 0f 05 <48> 89 c2 48 3d 00 f0 ff ff 76 10 48 8b 05 50 a0 0d 00 f7 da 64 89
RSP: 002b:00007ffee175a130 EFLAGS: 00000206 ORIG_RAX: 00000000000001b7
RAX: ffffffffffffffda RBX: 00007ffee175b2c0 RCX: 00007fdb74316da6
RDX: 0000000000000000 RSI: 00007fdb747819d0 RDI: 000000000000000b
RBP: 000055ea3ff281b0 R08: 000055ea3fe95ac0 R09: 00007fdb743f1b20
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 1494 at lib/refcount.c:28 refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 1494 Comm: udevd Not tainted 6.7.0-rc2-next-20231124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Code: ff 89 de e8 78 4b 24 fd 84 db 0f 85 66 ff ff ff e8 3b 50 24 fd c6 05 7e 9b 9f 0a 01 90 48 c7 c7 e0 c1 2e 8b e8 57 42 ea fc 90 <0f> 0b 90 90 e9 43 ff ff ff e8 18 50 24 fd 0f b6 1d 59 9b 9f 0a 31
RSP: 0018:ffffc9000b61fcc0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814e05d9
RDX: ffff88803d4dbb80 RSI: ffffffff814e05e6 RDI: 0000000000000001
RBP: ffff888083fb423c R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffed1004c8deb0
R13: ffff88802646f600 R14: 0000000000000000 R15: ffff88802646f580
FS:  00007fdb74693c80(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f52b2cc56be CR3: 000000007c5fb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 stack_depot_put lib/stackdepot.c:627 [inline]
 stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
 qlink_free mm/kasan/quarantine.c:159 [inline]
 qlist_free_all+0x16d/0x1e0 mm/kasan/quarantine.c:201
 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:308
 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:307
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook mm/slab.h:763 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x163/0x300 mm/slub.c:3476
 getname_flags.part.0+0x50/0x4e0 fs/namei.c:140
 getname_flags+0x9b/0xf0 include/linux/audit.h:321
 user_path_at_empty+0x2c/0x60 fs/namei.c:2922
 user_path_at include/linux/namei.h:57 [inline]
 do_faccessat+0x13c/0xb40 fs/open.c:484
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fdb74316da6
Code: 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 41 55 41 89 ca 41 89 d5 b8 b7 01 00 00 41 54 41 89 cc 55 53 48 81 ec 98 00 00 00 0f 05 <48> 89 c2 48 3d 00 f0 ff ff 76 10 48 8b 05 50 a0 0d 00 f7 da 64 89
RSP: 002b:00007ffee175a130 EFLAGS: 00000206 ORIG_RAX: 00000000000001b7
RAX: ffffffffffffffda RBX: 00007ffee175b2c0 RCX: 00007fdb74316da6
RDX: 0000000000000000 RSI: 00007fdb747819d0 RDI: 000000000000000b
RBP: 000055ea3ff281b0 R08: 000055ea3fe95ac0 R09: 00007fdb743f1b20
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>