INFO: task syz-executor.1:11832 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.1 state:D stack: 0 pid:11832 ppid: 13903 flags:0x00000001 Backtrace: [<82134be0>] (__schedule) from [<82135904>] (schedule+0x5c/0x108 kernel/sched/core.c:5154) r10:88b07658 r9:88b07600 r8:82136748 r7:88ee8b14 r6:88ee8b10 r5:892fe000 r4:8876b0c0 [<821358a8>] (schedule) from [<8213b4d4>] (schedule_timeout+0xe0/0x12c kernel/time/timer.c:1868) r5:892fe000 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) r6:88ee8b10 r5:892fe000 r4:7fffffff [<821366c4>] (wait_for_completion) from [<805596cc>] (io_sq_thread_finish+0x38/0x234 fs/io_uring.c:7127) r8:88ee8ac4 r7:89c230c0 r6:200009c0 r5:88ee8800 r4:88b07600 [<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) r9:88b07600 r8:88ee8ac4 r7:89c230c0 r6:200009c0 r5:fffffff5 r4:88ee8800 [<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 r9:892fe000 r8:80200224 r7:000001a9 r6:20ff9000 r5:20ffb000 r4:76f55070 [<80567ce8>] (sys_io_uring_setup) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64) Exception stack(0x892fffa8 to 0x892ffff0) ffa0: 76f55070 20ffb000 00002a79 200009c0 20ffb000 00000003 ffc0: 76f55070 20ffb000 20ff9000 000001a9 20000a40 20ff9000 7eb8a914 76f5520c ffe0: 76f55010 76f55000 000120b8 0004b440 Showing all locks held in the system: 1 lock held by khungtaskd/1525: #0: 8390e91c (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x34/0x1dc kernel/locking/lockdep.c:6329 2 locks held by getty/4304: #0: 86ed5454 (&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 2 locks held by kworker/u4:2/11954: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1525 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 r6:600e0013 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 r7:00007f6b r6:83835150 r5:000b8680 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 r6:847c2000 r5:8473ba40 r4:84755400 [<80271dbc>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158) Exception stack(0x847c3fb0 to 0x847c3ff8) 3fa0: 00000000 00000000 00000000 00000000 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80271dbc r4:8473ba40 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express PC is at arch_cpu_idle+0x48/0x4c arch/arm/kernel/process.c:75 LR is at arch_cpu_idle+0x44/0x4c arch/arm/kernel/process.c:73 pc : [<80209438>] lr : [<80209434>] psr: 20000013 sp : 8453df68 ip : 8453df58 fp : 8453df74 r10: 00000000 r9 : 00000000 r8 : 00000002 r7 : 83822cd4 r6 : 83822c98 r5 : 00000001 r4 : 8453c000 r3 : 8021e080 r2 : 00000001 r1 : 82ae5774 r0 : 00000001 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 88781880 DAC: 00000000 CPU: 1 PID: 0 Comm: swapper/1 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 r6:60000193 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 r5:8453df18 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) r9:8453df18 r8:8453de80 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) r10:8453deb0 r9:8453df18 r8:00000001 r7:00000000 r6:836c6498 r5:00000000 r4:836c6498 r3:00010001 [<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) r10:00000000 r9:40000193 r8:e000200c r7:836c64bc r6:e0002000 r5:8453df18 r4:8382343c [<8093180c>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205) Exception stack(0x8453df18 to 0x8453df60) df00: 00000001 82ae5774 df20: 00000001 8021e080 8453c000 00000001 83822c98 83822cd4 00000002 00000000 df40: 00000000 8453df74 8453df58 8453df68 80209434 80209438 20000013 ffffffff r9:8453c000 r8:00000002 r7:8453df4c r6:ffffffff r5:20000013 r4:80209438 [<802093f0>] (arch_cpu_idle) from [<8213bdf0>] (default_idle_call+0x50/0x9c kernel/sched/idle.c:112) [<8213bda0>] (default_idle_call) from [<8028e178>] (cpuidle_idle_call kernel/sched/idle.c:194 [inline]) [<8213bda0>] (default_idle_call) from [<8028e178>] (do_idle+0x26c/0x2f8 kernel/sched/idle.c:300) [<8028df0c>] (do_idle) from [<8028e624>] (cpu_startup_entry+0x20/0x24 kernel/sched/idle.c:397) r10:00000000 r9:412fc0f1 r8:80003010 r7:8453dff8 r6:83836dc0 r5:83928f70 r4:00000091 [<8028e604>] (cpu_startup_entry) from [<802118bc>] (secondary_start_kernel+0x1e0/0x2b0 arch/arm/kernel/smp.c:470) [<802116dc>] (secondary_start_kernel) from [<80201950>] (__enable_mmu+0x0/0x10 arch/arm/kernel/head.S:399) r7:8453dff8 r6:30c0387d r5:00000000 r4:844c3300