INFO: task syz-executor.0:10978 blocked for more than 430 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack: 0 pid:10978 ppid: 4378 flags:0x00000001 Backtrace: [<82134be0>] (__schedule) from [<82135904>] (schedule+0x5c/0x108 kernel/sched/core.c:5154) r10:88513c58 r9:88513c00 r8:82136748 r7:887b9b14 r6:887b9b10 r5:88db4000 r4:88ef0000 [<821358a8>] (schedule) from [<8213b4d4>] (schedule_timeout+0xe0/0x12c kernel/time/timer.c:1868) r5:88db4000 r4:7fffffff [<8213b3f4>] (schedule_timeout) from [<82136778>] (do_wait_for_common kernel/sched/completion.c:85 [inline]) [<8213b3f4>] (schedule_timeout) from [<82136778>] (__wait_for_common kernel/sched/completion.c:106 [inline]) [<8213b3f4>] (schedule_timeout) from [<82136778>] (wait_for_common kernel/sched/completion.c:117 [inline]) [<8213b3f4>] (schedule_timeout) from [<82136778>] (wait_for_completion+0xb4/0x124 kernel/sched/completion.c:138) r6:887b9b10 r5:88db4000 r4:7fffffff [<821366c4>] (wait_for_completion) from [<805596cc>] (io_sq_thread_finish+0x38/0x234 fs/io_uring.c:7127) r8:887b9ac4 r7:86a06180 r6:20000140 r5:887b9800 r4:88513c00 [<80559694>] (io_sq_thread_finish) from [<80560c74>] (io_sq_offload_create fs/io_uring.c:7928 [inline]) [<80559694>] (io_sq_thread_finish) from [<80560c74>] (io_uring_create fs/io_uring.c:9401 [inline]) [<80559694>] (io_sq_thread_finish) from [<80560c74>] (io_uring_setup+0xba4/0xf4c fs/io_uring.c:9484) r9:88513c00 r8:887b9ac4 r7:86a06180 r6:20000140 r5:fffffffc r4:887b9800 [<805600d0>] (io_uring_setup) from [<80567cf8>] (__do_sys_io_uring_setup fs/io_uring.c:9490 [inline]) [<805600d0>] (io_uring_setup) from [<80567cf8>] (sys_io_uring_setup+0x10/0x14 fs/io_uring.c:9487) r10:000001a9 r9:88db4000 r8:80200224 r7:000001a9 r6:20ffc000 r5:20ffc000 r4:76f45070 [<80567ce8>] (sys_io_uring_setup) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64) Exception stack(0x88db5fa8 to 0x88db5ff0) 5fa0: 76f45070 20ffc000 00000686 20000140 20ffc000 00000003 5fc0: 76f45070 20ffc000 20ffc000 000001a9 20000080 20ffc000 7ec2e914 76f4520c 5fe0: 76f45010 76f45000 000120b8 0004b440 Showing all locks held in the system: 1 lock held by khungtaskd/1524: #0: 8390e91c (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x34/0x1dc kernel/locking/lockdep.c:6329 2 locks held by getty/4303: #0: 86ea7054 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x38/0x3c drivers/tty/tty_ldsem.c:340 #1: e85fa290 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x4a4/0x56c drivers/tty/n_tty.c:2178 3 locks held by kworker/u4:2/11002: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1524 Comm: khungtaskd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<82107878>] (dump_backtrace) from [<82107aec>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000000 r6:60000013 r5:00000000 r4:83966184 [<82107ad4>] (show_stack) from [<82110ac0>] (__dump_stack lib/dump_stack.c:79 [inline]) [<82107ad4>] (show_stack) from [<82110ac0>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<82110a08>] (dump_stack) from [<8091ce60>] (nmi_cpu_backtrace+0xfc/0x160 lib/nmi_backtrace.c:105) r7:00000000 r6:80210934 r5:00000000 r4:00000000 [<8091cd64>] (nmi_cpu_backtrace) from [<8091d000>] (nmi_trigger_cpumask_backtrace+0x13c/0x224 lib/nmi_backtrace.c:62) r5:83823424 r4:00000000 [<8091cec4>] (nmi_trigger_cpumask_backtrace) from [<80211dec>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:857) r9:83822dd8 r8:83806d00 r7:00007f6e r6:83835150 r5:0002f1c0 r4:83ac7699 [<80211dd4>] (arch_trigger_cpumask_backtrace) from [<80365d1c>] (trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]) [<80211dd4>] (arch_trigger_cpumask_backtrace) from [<80365d1c>] (check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]) [<80211dd4>] (arch_trigger_cpumask_backtrace) from [<80365d1c>] (watchdog+0x6d0/0x88c kernel/hung_task.c:294) [<8036564c>] (watchdog) from [<80271f40>] (kthread+0x184/0x1a4 kernel/kthread.c:292) r10:84505e2c r9:00000000 r8:8036564c r7:00000000 r6:84740000 r5:8475fd80 r4:846f8a00 [<80271dbc>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158) Exception stack(0x84741fb0 to 0x84741ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80271dbc r4:8475fd80 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4140 Comm: klogd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express PC is at syslog_print+0x164/0x290 kernel/printk/printk.c:1474 LR is at __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:70 pc : [<802d32e8>] lr : [<821332a4>] psr: 200f0013 sp : 86fa9e20 ip : 86fa9dc8 fp : 86fa9ed4 r10: 00000026 r9 : 000d6b7c r8 : 8416fa28 r7 : 000002fc r6 : 00000103 r5 : 00000000 r4 : 8416fb48 r3 : 0000ee1d r2 : 00000001 r1 : 82aed410 r0 : 00000001 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86e66140 DAC: 00000000 CPU: 1 PID: 4140 Comm: klogd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<82107878>] (dump_backtrace) from [<82107aec>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000080 r6:600f0193 r5:00000000 r4:83966184 [<82107ad4>] (show_stack) from [<82110ac0>] (__dump_stack lib/dump_stack.c:79 [inline]) [<82107ad4>] (show_stack) from [<82110ac0>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<82110a08>] (dump_stack) from [<802096bc>] (show_regs+0x14/0x18 arch/arm/kernel/process.c:191) r7:8440cd80 r6:00000001 r5:86fa9dd0 r4:00000001 [<802096a8>] (show_regs) from [<8091ce48>] (nmi_cpu_backtrace+0xe4/0x160 lib/nmi_backtrace.c:103) [<8091cd64>] (nmi_cpu_backtrace) from [<80210e34>] (do_handle_IPI+0x4c/0x440 arch/arm/kernel/smp.c:672) r5:00000017 r4:00000007 [<80210de8>] (do_handle_IPI) from [<80211248>] (ipi_handler+0x20/0x28 arch/arm/kernel/smp.c:700) r9:86fa9dd0 r8:86fa9d38 r7:8440cd80 r6:8382343c r5:00000017 r4:844a4600 [<80211228>] (ipi_handler) from [<802dfc04>] (handle_percpu_devid_irq+0xa4/0x19c kernel/irq/chip.c:930) [<802dfb60>] (handle_percpu_devid_irq) from [<802d8a30>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]) [<802dfb60>] (handle_percpu_devid_irq) from [<802d8a30>] (generic_handle_irq kernel/irq/irqdesc.c:652 [inline]) [<802dfb60>] (handle_percpu_devid_irq) from [<802d8a30>] (__handle_domain_irq+0xb0/0x120 kernel/irq/irqdesc.c:689) r10:86fa9d68 r9:86fa9dd0 r8:00000001 r7:00000000 r6:836c6498 r5:00000000 r4:836c6498 r3:00010000 [<802d8980>] (__handle_domain_irq) from [<80931890>] (handle_domain_irq include/linux/irqdesc.h:176 [inline]) [<802d8980>] (__handle_domain_irq) from [<80931890>] (gic_handle_irq+0x84/0xac drivers/irqchip/irq-gic.c:370) r10:00000026 r9:400f0193 r8:e000200c r7:836c64bc r6:e0002000 r5:86fa9dd0 r4:8382343c [<8093180c>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205) Exception stack(0x86fa9dd0 to 0x86fa9e18) 9dc0: 00000001 82aed410 00000001 0000ee1d 9de0: 8416fb48 00000000 00000103 000002fc 8416fa28 000d6b7c 00000026 86fa9ed4 9e00: 86fa9dc8 86fa9e20 821332a4 802d32e8 200f0013 ffffffff r9:86fa8000 r8:8416fa28 r7:86fa9e04 r6:ffffffff r5:200f0013 r4:802d32e8 [<802d3184>] (syslog_print) from [<802d3a3c>] (do_syslog.part.0+0x1cc/0x428 kernel/printk/printk.c:1588) r10:83845e5c r9:8416fb48 r8:86fa9ee4 r7:83845d78 r6:000d6880 r5:00000000 r4:000003ff [<802d3870>] (do_syslog.part.0) from [<802d52dc>] (do_syslog kernel/printk/printk.c:1569 [inline]) [<802d3870>] (do_syslog.part.0) from [<802d52dc>] (__do_sys_syslog kernel/printk/printk.c:1680 [inline]) [<802d3870>] (do_syslog.part.0) from [<802d52dc>] (sys_syslog+0x3c/0x40 kernel/printk/printk.c:1678) r10:00000067 r9:86fa8000 r8:80200224 r7:00000067 r6:000003ff r5:000d6880 r4:00000002 [<802d52a0>] (sys_syslog) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64) Exception stack(0x86fa9fa8 to 0x86fa9ff0) 9fa0: 000d6880 000d6bcb 00000002 000d6880 000003ff 000003fe 9fc0: 000d6880 000d6bcb 00000000 00000067 000d6880 000d6c90 000d6c90 00000000 9fe0: 000d6354 7e886c94 00057234 76ec370c r7:00000067 r6:00000000 r5:000d6bcb r4:000d6880