------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.1.1345/10940 is trying to acquire lock: ffffffff8eaf4160 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1902 but task is already holding lock: ffff8880b843b520 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:675 [inline] ffff8880b843b520 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:659 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&rq->__lock){-.-.}-{2:2}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:382 raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:667 raw_spin_rq_lock kernel/sched/sched.h:1653 [inline] _task_rq_lock+0xcf/0x500 kernel/sched/core.c:762 cgroup_move_task+0x81/0x320 kernel/sched/psi.c:1176 css_set_move_task+0x285/0x600 kernel/cgroup/cgroup.c:925 cgroup_post_fork+0x1f9/0x9a0 kernel/cgroup/cgroup.c:7009 copy_process+0x6b7a/0x8030 kernel/fork.c:2550 kernel_clone+0x176/0x9d0 kernel/fork.c:2748 user_mode_thread+0xcc/0x110 kernel/fork.c:2824 rest_init+0x21/0x260 init/main.c:682 start_kernel+0x48e/0x490 init/main.c:1175 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x158 -> #3 (&p->pi_lock){-.-.}-{2:2}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:571 [inline] try_to_wake_up+0xbd/0x1c90 kernel/sched/core.c:4292 create_worker+0x346/0x750 kernel/workqueue.c:2893 workqueue_init+0x768/0x930 kernel/workqueue.c:8169 kernel_init_freeable+0x3d4/0x7b0 init/main.c:1643 kernel_init+0x1f/0x1e0 init/main.c:1548 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&pool->lock){-.-.}-{2:2}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 __queue_work+0x5d4/0x12b0 kernel/workqueue.c:2347 queue_work_on+0x1a9/0x1e0 kernel/workqueue.c:2452 queue_work include/linux/workqueue.h:699 [inline] schedule_work include/linux/workqueue.h:760 [inline] hci_uart_tx_wakeup+0x224/0x540 drivers/bluetooth/hci_ldisc.c:138 hci_uart_tty_wakeup+0x169/0x1b0 drivers/bluetooth/hci_ldisc.c:626 tty_wakeup+0xe8/0x120 drivers/tty/tty_io.c:515 tty_port_default_wakeup+0x47/0x60 drivers/tty/tty_port.c:67 serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1723 serial8250_handle_irq_locked+0x770/0x9a0 drivers/tty/serial/8250/8250_port.c:1837 serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1853 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1849 [inline] serial8250_default_handle_irq+0xc2/0x280 drivers/tty/serial/8250/8250_port.c:1867 serial8250_interrupt+0xf8/0x1b0 drivers/tty/serial/8250/8250_core.c:86 __handle_irq_event_percpu+0x232/0x880 kernel/irq/handle.c:209 handle_irq_event_percpu kernel/irq/handle.c:246 [inline] handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263 handle_edge_irq+0x34c/0x950 kernel/irq/chip.c:859 generic_handle_irq_desc include/linux/irqdesc.h:188 [inline] handle_irq arch/x86/kernel/irq.c:209 [inline] call_irq_handler arch/x86/kernel/irq.c:265 [inline] __common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280 common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:273 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665 sha256_transform_rorx+0x907/0x1120 lib/crypto/x86/sha256-avx2-asm.S:606 sha256_blocks_avx2+0x49/0x90 lib/crypto/x86/sha256.h:31 sha256_blocks lib/crypto/x86/sha256.h:58 [inline] __sha256_update+0x188/0x1c0 lib/crypto/sha256.c:208 crypto_sha256_update+0x23/0x30 crypto/sha256.c:142 crypto_shash_finup+0x34b/0x6b0 crypto/shash.c:123 crypto_shash_update include/crypto/hash.h:998 [inline] ima_calc_file_hash_tfm+0x299/0x350 security/integrity/ima/ima_crypto.c:233 ima_calc_file_hash+0x1e3/0x380 security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x94f/0xb30 security/integrity/ima/ima_api.c:300 process_measurement+0xdfe/0x2350 security/integrity/ima/ima_main.c:425 ima_file_check+0xc3/0x110 security/integrity/ima/ima_main.c:685 security_file_post_open+0xc4/0x210 security/security.c:2755 do_open fs/namei.c:4702 [inline] path_openat+0x985/0x4280 fs/namei.c:4863 do_file_open+0x20e/0x430 fs/namei.c:4892 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&port_lock_key){-.-.}-{3:3}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166 uart_port_lock_irqsave include/linux/serial_core.h:719 [inline] serial8250_console_write+0x177/0x1a50 drivers/tty/serial/8250/8250_port.c:3344 console_emit_next_record kernel/printk/printk.c:3183 [inline] console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208 univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515 console_init+0x3d5/0x5b0 kernel/printk/printk.c:4407 start_kernel+0x314/0x490 init/main.c:1112 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x158 -> #0 (console_owner){-.-.}-{0:0}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902 console_emit_next_record kernel/printk/printk.c:3177 [inline] console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 __report_bug.cold+0x34/0x141 lib/bug.c:248 report_bug+0xb2/0x220 lib/bug.c:286 handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:593 lockdep_assert_rq_held kernel/sched/sched.h:1641 [inline] lockdep_assert_rq_held kernel/sched/sched.h:1638 [inline] update_rq_clock+0x40a/0xd20 kernel/sched/core.c:865 pick_next_task kernel/sched/core.c:6338 [inline] __schedule+0x1e2d/0x6730 kernel/sched/core.c:7149 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:198 __unix_dgram_recvmsg+0x31a/0xc30 net/unix/af_unix.c:2608 unix_dgram_recvmsg+0xcd/0x100 net/unix/af_unix.c:2682 sock_recvmsg_nosec net/socket.c:1126 [inline] ____sys_recvmsg+0x5eb/0x670 net/socket.c:2902 ___sys_recvmsg+0x16a/0x1a0 net/socket.c:2946 do_recvmmsg+0x2f3/0x740 net/socket.c:3041 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3131 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: console_owner --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock(console_owner); *** DEADLOCK *** 4 locks held by syz.1.1345/10940: #0: ffff888068c8b8f0 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x255/0xc30 net/unix/af_unix.c:2580 #1: ffff8880b843b520 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:675 [inline] #1: ffff8880b843b520 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:659 #2: ffffffff8ebd45a0 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x110 kernel/printk/printk.c:2504 #3: ffffffff8ebd4618 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline] #3: ffffffff8ebd4618 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline] #3: ffffffff8ebd4618 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline] #3: ffffffff8ebd4618 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xe50 kernel/printk/printk.c:3246 stack backtrace: CPU: 0 UID: 0 PID: 10940 Comm: syz.1.1345 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902 console_emit_next_record kernel/printk/printk.c:3177 [inline] console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 __report_bug.cold+0x34/0x141 lib/bug.c:248 report_bug+0xb2/0x220 lib/bug.c:286 handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:593 RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1641 [inline] RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1638 [inline] RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:865 Code: ab c8 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 c0 0b 00 00 48 b8 00 00 00 00 00 RSP: 0018:ffffc90004647628 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b853b4c0 RCX: 0000000000000001 RDX: 0000000000000046 RSI: ffffffff8e1810a7 RDI: ffffffff8c3ffa80 RBP: ffffc900046477d0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff9121f5d7 R11: 0000000000000000 R12: ffffffff912229a4 R13: ffff8880b853c3a0 R14: ffff88801eac4a80 R15: ffff8880b843c058 pick_next_task kernel/sched/core.c:6338 [inline] __schedule+0x1e2d/0x6730 kernel/sched/core.c:7149 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:198 __unix_dgram_recvmsg+0x31a/0xc30 net/unix/af_unix.c:2608 unix_dgram_recvmsg+0xcd/0x100 net/unix/af_unix.c:2682 sock_recvmsg_nosec net/socket.c:1126 [inline] ____sys_recvmsg+0x5eb/0x670 net/socket.c:2902 ___sys_recvmsg+0x16a/0x1a0 net/socket.c:2946 do_recvmmsg+0x2f3/0x740 net/socket.c:3041 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3131 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f29d159e0d9 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:00007f29d2494028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f29d1826090 RCX: 00007f29d159e0d9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f29d1635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f29d1826128 R14: 00007f29d1826090 R15: 00007fff7bb8d318 debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0) WARNING: kernel/sched/sched.h:1641 at lockdep_assert_rq_held kernel/sched/sched.h:1641 [inline], CPU#0: syz.1.1345/10940 WARNING: kernel/sched/sched.h:1641 at lockdep_assert_rq_held kernel/sched/sched.h:1638 [inline], CPU#0: syz.1.1345/10940 WARNING: kernel/sched/sched.h:1641 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:865, CPU#0: syz.1.1345/10940 Modules linked in: CPU: 0 UID: 0 PID: 10940 Comm: syz.1.1345 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1641 [inline] RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1638 [inline] RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:865 Code: ab c8 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 c0 0b 00 00 48 b8 00 00 00 00 00 RSP: 0018:ffffc90004647628 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b853b4c0 RCX: 0000000000000001 RDX: 0000000000000046 RSI: ffffffff8e1810a7 RDI: ffffffff8c3ffa80 RBP: ffffc900046477d0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff9121f5d7 R11: 0000000000000000 R12: ffffffff912229a4 R13: ffff8880b853c3a0 R14: ffff88801eac4a80 R15: ffff8880b843c058 FS: 00007f29d24946c0(0000) GS:ffff888123ded000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000159030 CR3: 00000000773ef000 CR4: 00000000003526f0 Call Trace: pick_next_task kernel/sched/core.c:6338 [inline] __schedule+0x1e2d/0x6730 kernel/sched/core.c:7149 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:198 __unix_dgram_recvmsg+0x31a/0xc30 net/unix/af_unix.c:2608 unix_dgram_recvmsg+0xcd/0x100 net/unix/af_unix.c:2682 sock_recvmsg_nosec net/socket.c:1126 [inline] ____sys_recvmsg+0x5eb/0x670 net/socket.c:2902 ___sys_recvmsg+0x16a/0x1a0 net/socket.c:2946 do_recvmmsg+0x2f3/0x740 net/socket.c:3041 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3131 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f29d159e0d9 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:00007f29d2494028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f29d1826090 RCX: 00007f29d159e0d9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f29d1635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f29d1826128 R14: 00007f29d1826090 R15: 00007fff7bb8d318