FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 5.15.163-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.1199/8444 is trying to acquire lock: ffff800014b6f4b8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x28/0xd8 kernel/locking/semaphore.c:138 but task is already holding lock: ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:475 [inline] ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1621 [inline] ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x328/0x1e48 kernel/sched/core.c:6290 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0xb4/0x110 kernel/locking/spinlock.c:368 raw_spin_rq_lock_nested+0x2c/0x44 kernel/sched/core.c:475 raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] rq_lock kernel/sched/sched.h:1621 [inline] task_fork_fair+0x7c/0x23c kernel/sched/fair.c:11495 sched_cgroup_fork+0x334/0x3d8 kernel/sched/core.c:4466 copy_process+0x24d4/0x3750 kernel/fork.c:2320 kernel_clone+0x1d8/0xa58 kernel/fork.c:2604 kernel_thread+0x148/0x1bc kernel/fork.c:2656 rest_init+0x2c/0x38c init/main.c:706 arch_call_rest_init+0x14/0x20 init/main.c:893 start_kernel+0x440/0x600 init/main.c:1140 __primary_switched+0xa8/0xb0 arch/arm64/kernel/head.S:468 -> #1 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162 try_to_wake_up+0xb0/0xc2c kernel/sched/core.c:4030 wake_up_process+0x18/0x24 kernel/sched/core.c:4215 __up+0x11c/0x148 kernel/locking/semaphore.c:265 up+0x90/0xb0 kernel/locking/semaphore.c:190 __up_console_sem+0x8c/0x100 kernel/printk/printk.c:256 console_unlock+0x1160/0x1394 kernel/printk/printk.c:2760 vprintk_emit+0x140/0x21c kernel/printk/printk.c:2274 vprintk_default+0xa0/0xe4 kernel/printk/printk.c:2289 vprintk+0x200/0x2d4 kernel/printk/printk_safe.c:45 _printk+0xdc/0x128 kernel/printk/printk.c:2299 bt_err+0xfc/0x144 net/bluetooth/lib.c:180 hci_cmd_timeout+0x14c/0x204 net/bluetooth/hci_core.c:2779 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 -> #0 ((console_sem).lock){-.-.}-{2:2}: 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+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162 down_trylock+0x28/0xd8 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x80/0x144 kernel/printk/printk.c:239 console_trylock+0xb8/0x1f8 kernel/printk/printk.c:2575 console_trylock_spinning+0x1c/0x288 kernel/printk/printk.c:1867 vprintk_emit+0x124/0x21c kernel/printk/printk.c:2273 vprintk_default+0xa0/0xe4 kernel/printk/printk.c:2289 vprintk+0x200/0x2d4 kernel/printk/printk_safe.c:45 _printk+0xdc/0x128 kernel/printk/printk.c:2299 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x398/0x514 lib/fault-inject.c:146 __should_fail_alloc_page mm/page_alloc.c:3777 [inline] should_fail_alloc_page+0x74/0xa8 mm/page_alloc.c:3814 prepare_alloc_pages+0x160/0x460 mm/page_alloc.c:5200 __alloc_pages+0x138/0x674 mm/page_alloc.c:5412 alloc_pages+0x368/0x5d4 stack_depot_save+0x368/0x4a4 lib/stackdepot.c:302 kasan_save_stack+0x54/0x68 mm/kasan/common.c:40 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348 irq_work_queue_on+0xcc/0x224 kernel/irq_work.c:101 tell_cpu_to_push+0x1d8/0x408 kernel/sched/rt.c:2155 pull_rt_task kernel/sched/rt.c:2221 [inline] balance_rt+0x268/0x354 kernel/sched/rt.c:1560 put_prev_task_balance kernel/sched/core.c:5624 [inline] __pick_next_task kernel/sched/core.c:5664 [inline] pick_next_task kernel/sched/core.c:6192 [inline] __schedule+0x714/0x1e48 kernel/sched/core.c:6340 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 io_schedule+0x8c/0x194 kernel/sched/core.c:8484 bit_wait_io+0x1c/0xac kernel/sched/wait_bit.c:209 __wait_on_bit kernel/sched/wait_bit.c:49 [inline] out_of_line_wait_on_bit+0x208/0x33c kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x80/0x90 fs/buffer.c:122 wait_on_buffer include/linux/buffer_head.h:390 [inline] __ext4_find_entry+0xd20/0x1614 fs/ext4/namei.c:1680 ext4_find_entry+0x200/0x330 fs/ext4/namei.c:1750 ext4_get_parent+0xc4/0x2ec fs/ext4/namei.c:1893 reconnect_one fs/exportfs/expfs.c:131 [inline] reconnect_path+0x18c/0x68c fs/exportfs/expfs.c:222 exportfs_decode_fh_raw+0x1c4/0x4b4 fs/exportfs/expfs.c:459 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x5b8/0x9f0 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by syz.1.1199/8444: #0: ffff0000e5f48de8 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #0: ffff0000e5f48de8 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: reconnect_one fs/exportfs/expfs.c:129 [inline] #0: ffff0000e5f48de8 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: reconnect_path+0x134/0x68c fs/exportfs/expfs.c:222 #1: ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:475 [inline] #1: ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] #1: ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1621 [inline] #1: ffff0001b47e8958 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x328/0x1e48 kernel/sched/core.c:6290 stack backtrace: CPU: 1 PID: 8444 Comm: syz.1.1199 Not tainted 5.15.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2011 check_noncircular+0x2cc/0x378 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+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162 down_trylock+0x28/0xd8 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x80/0x144 kernel/printk/printk.c:239 console_trylock+0xb8/0x1f8 kernel/printk/printk.c:2575 console_trylock_spinning+0x1c/0x288 kernel/printk/printk.c:1867 vprintk_emit+0x124/0x21c kernel/printk/printk.c:2273 vprintk_default+0xa0/0xe4 kernel/printk/printk.c:2289 vprintk+0x200/0x2d4 kernel/printk/printk_safe.c:45 _printk+0xdc/0x128 kernel/printk/printk.c:2299 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x398/0x514 lib/fault-inject.c:146 __should_fail_alloc_page mm/page_alloc.c:3777 [inline] should_fail_alloc_page+0x74/0xa8 mm/page_alloc.c:3814 prepare_alloc_pages+0x160/0x460 mm/page_alloc.c:5200 __alloc_pages+0x138/0x674 mm/page_alloc.c:5412 alloc_pages+0x368/0x5d4 stack_depot_save+0x368/0x4a4 lib/stackdepot.c:302 kasan_save_stack+0x54/0x68 mm/kasan/common.c:40 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348 irq_work_queue_on+0xcc/0x224 kernel/irq_work.c:101 tell_cpu_to_push+0x1d8/0x408 kernel/sched/rt.c:2155 pull_rt_task kernel/sched/rt.c:2221 [inline] balance_rt+0x268/0x354 kernel/sched/rt.c:1560 put_prev_task_balance kernel/sched/core.c:5624 [inline] __pick_next_task kernel/sched/core.c:5664 [inline] pick_next_task kernel/sched/core.c:6192 [inline] __schedule+0x714/0x1e48 kernel/sched/core.c:6340 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 io_schedule+0x8c/0x194 kernel/sched/core.c:8484 bit_wait_io+0x1c/0xac kernel/sched/wait_bit.c:209 __wait_on_bit kernel/sched/wait_bit.c:49 [inline] out_of_line_wait_on_bit+0x208/0x33c kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x80/0x90 fs/buffer.c:122 wait_on_buffer include/linux/buffer_head.h:390 [inline] __ext4_find_entry+0xd20/0x1614 fs/ext4/namei.c:1680 ext4_find_entry+0x200/0x330 fs/ext4/namei.c:1750 ext4_get_parent+0xc4/0x2ec fs/ext4/namei.c:1893 reconnect_one fs/exportfs/expfs.c:131 [inline] reconnect_path+0x18c/0x68c fs/exportfs/expfs.c:222 exportfs_decode_fh_raw+0x1c4/0x4b4 fs/exportfs/expfs.c:459 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x5b8/0x9f0 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 CPU: 1 PID: 8444 Comm: syz.1.1199 Not tainted 5.15.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 fail_dump lib/fault-inject.c:52 [inline] should_fail+0x3b8/0x514 lib/fault-inject.c:146 __should_fail_alloc_page mm/page_alloc.c:3777 [inline] should_fail_alloc_page+0x74/0xa8 mm/page_alloc.c:3814 prepare_alloc_pages+0x160/0x460 mm/page_alloc.c:5200 __alloc_pages+0x138/0x674 mm/page_alloc.c:5412 alloc_pages+0x368/0x5d4 stack_depot_save+0x368/0x4a4 lib/stackdepot.c:302 kasan_save_stack+0x54/0x68 mm/kasan/common.c:40 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348 irq_work_queue_on+0xcc/0x224 kernel/irq_work.c:101 tell_cpu_to_push+0x1d8/0x408 kernel/sched/rt.c:2155 pull_rt_task kernel/sched/rt.c:2221 [inline] balance_rt+0x268/0x354 kernel/sched/rt.c:1560 put_prev_task_balance kernel/sched/core.c:5624 [inline] __pick_next_task kernel/sched/core.c:5664 [inline] pick_next_task kernel/sched/core.c:6192 [inline] __schedule+0x714/0x1e48 kernel/sched/core.c:6340 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 io_schedule+0x8c/0x194 kernel/sched/core.c:8484 bit_wait_io+0x1c/0xac kernel/sched/wait_bit.c:209 __wait_on_bit kernel/sched/wait_bit.c:49 [inline] out_of_line_wait_on_bit+0x208/0x33c kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x80/0x90 fs/buffer.c:122 wait_on_buffer include/linux/buffer_head.h:390 [inline] __ext4_find_entry+0xd20/0x1614 fs/ext4/namei.c:1680 ext4_find_entry+0x200/0x330 fs/ext4/namei.c:1750 ext4_get_parent+0xc4/0x2ec fs/ext4/namei.c:1893 reconnect_one fs/exportfs/expfs.c:131 [inline] reconnect_path+0x18c/0x68c fs/exportfs/expfs.c:222 exportfs_decode_fh_raw+0x1c4/0x4b4 fs/exportfs/expfs.c:459 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x5b8/0x9f0 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584