INFO: task syz-executor.0:9784 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: 9784 ppid: 4378 flags:0x00000001 Backtrace: [<82134aa0>] (__schedule) from [<821357c4>] (schedule+0x5c/0x108 kernel/sched/core.c:5154) r10:88e68a58 r9:88e68a00 r8:82136608 r7:88e56314 r6:88e56310 r5:88fa6000 r4:88b4d140 [<82135768>] (schedule) from [<8213b394>] (schedule_timeout+0xe0/0x12c kernel/time/timer.c:1868) r5:88fa6000 r4:7fffffff [<8213b2b4>] (schedule_timeout) from [<82136638>] (do_wait_for_common kernel/sched/completion.c:85 [inline]) [<8213b2b4>] (schedule_timeout) from [<82136638>] (__wait_for_common kernel/sched/completion.c:106 [inline]) [<8213b2b4>] (schedule_timeout) from [<82136638>] (wait_for_common kernel/sched/completion.c:117 [inline]) [<8213b2b4>] (schedule_timeout) from [<82136638>] (wait_for_completion+0xb4/0x124 kernel/sched/completion.c:138) r6:88e56310 r5:88fa6000 r4:7fffffff [<82136584>] (wait_for_completion) from [<8055957c>] (io_sq_thread_finish+0x38/0x234 fs/io_uring.c:7127) r8:88e562c4 r7:88ef0000 r6:20000100 r5:88e56000 r4:88e68a00 [<80559544>] (io_sq_thread_finish) from [<80560b24>] (io_sq_offload_create fs/io_uring.c:7928 [inline]) [<80559544>] (io_sq_thread_finish) from [<80560b24>] (io_uring_create fs/io_uring.c:9401 [inline]) [<80559544>] (io_sq_thread_finish) from [<80560b24>] (io_uring_setup+0xba4/0xf4c fs/io_uring.c:9484) r9:88e68a00 r8:88e562c4 r7:88ef0000 r6:20000100 r5:fffffffc r4:88e56000 [<8055ff80>] (io_uring_setup) from [<80567ba8>] (__do_sys_io_uring_setup fs/io_uring.c:9490 [inline]) [<8055ff80>] (io_uring_setup) from [<80567ba8>] (sys_io_uring_setup+0x10/0x14 fs/io_uring.c:9487) r10:000001a9 r9:88fa6000 r8:80200224 r7:000001a9 r6:ffffffff r5:00000000 r4:00000000 [<80567b98>] (sys_io_uring_setup) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64) Exception stack(0x88fa7fa8 to 0x88fa7ff0) 7fa0: 00000000 00000000 00004ec4 20000100 00000000 00000000 7fc0: 00000000 00000000 ffffffff 000001a9 7eeb079a 76fbc6d0 7eeb0914 76fbc20c 7fe0: 76fbc048 76fbc038 00018c00 0004b440 Showing all locks held in the system: 3 locks held by kworker/u4:4/113: 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/4308: #0: 845b0854 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x38/0x3c drivers/tty/tty_ldsem.c:340 #1: e45f7290 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x4a4/0x56c drivers/tty/n_tty.c:2178 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1525 Comm: khungtaskd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<82107738>] (dump_backtrace) from [<821079ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000000 r6:600e0013 r5:00000000 r4:83966184 [<82107994>] (show_stack) from [<82110980>] (__dump_stack lib/dump_stack.c:79 [inline]) [<82107994>] (show_stack) from [<82110980>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<821108c8>] (dump_stack) from [<8091cd20>] (nmi_cpu_backtrace+0xfc/0x160 lib/nmi_backtrace.c:105) r7:00000000 r6:80210934 r5:00000000 r4:00000001 [<8091cc24>] (nmi_cpu_backtrace) from [<8091cec0>] (nmi_trigger_cpumask_backtrace+0x13c/0x224 lib/nmi_backtrace.c:62) r5:83823424 r4:00000001 [<8091cd84>] (nmi_trigger_cpumask_backtrace) from [<80211dec>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:857) r9:83822dd8 r8:83806d00 r7:00007f6d r6:83835150 r5:000208c0 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 r6:84644000 r5:8478b200 r4:8462be00 [<80271dbc>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158) Exception stack(0x84645fb0 to 0x84645ff8) 5fa0: 00000000 00000000 00000000 00000000 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80271dbc r4:8478b200 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 113 Comm: kworker/u4:4 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Workqueue: bat_events batadv_nc_worker PC is at __rcu_read_lock+0x38/0x70 kernel/rcu/tree_plugin.h:382 LR is at rcu_read_lock include/linux/rcupdate.h:654 [inline] LR is at batadv_nc_process_nc_paths.part.0+0x78/0x1c8 net/batman-adv/network-coding.c:683 pc : [<802eb6dc>] lr : [<8207c504>] psr: 80000013 sp : 846d7e10 ip : 846d7e20 fp : 846d7e1c r10: 00000088 r9 : 00000000 r8 : 00000076 r7 : 88befa00 r6 : 8207d2e0 r5 : 88b05740 r4 : 000001d8 r3 : 00000001 r2 : 00000001 r1 : 845ea080 r0 : 00000000 Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8852a100 DAC: fffffffd CPU: 0 PID: 113 Comm: kworker/u4:4 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Workqueue: bat_events batadv_nc_worker Backtrace: [<82107738>] (dump_backtrace) from [<821079ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000080 r6:60000193 r5:00000000 r4:83966184 [<82107994>] (show_stack) from [<82110980>] (__dump_stack lib/dump_stack.c:79 [inline]) [<82107994>] (show_stack) from [<82110980>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<821108c8>] (dump_stack) from [<802096bc>] (show_regs+0x14/0x18 arch/arm/kernel/process.c:191) r7:8440cd80 r6:00000000 r5:846d7dc0 r4:00000000 [<802096a8>] (show_regs) from [<8091cd08>] (nmi_cpu_backtrace+0xe4/0x160 lib/nmi_backtrace.c:103) [<8091cc24>] (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) r9:846d7dc0 r8:846d7d28 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) r10:846d7d58 r9:846d7dc0 r8:00000001 r7:00000000 r6:836c6498 r5:00000000 r4:836c6498 r3:00010000 [<802d8980>] (__handle_domain_irq) from [<80931750>] (handle_domain_irq include/linux/irqdesc.h:176 [inline]) [<802d8980>] (__handle_domain_irq) from [<80931750>] (gic_handle_irq+0x84/0xac drivers/irqchip/irq-gic.c:370) r10:00000088 r9:40000193 r8:e000200c r7:836c64bc r6:e0002000 r5:846d7dc0 r4:8382343c [<809316cc>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205) Exception stack(0x846d7dc0 to 0x846d7e08) 7dc0: 00000000 845ea080 00000001 00000001 000001d8 88b05740 8207d2e0 88befa00 7de0: 00000076 00000000 00000088 846d7e1c 846d7e20 846d7e10 8207c504 802eb6dc 7e00: 80000013 ffffffff r9:846d6000 r8:00000076 r7:846d7df4 r6:ffffffff r5:80000013 r4:802eb6dc [<802eb6a4>] (__rcu_read_lock) from [<8207c504>] (rcu_read_lock include/linux/rcupdate.h:654 [inline]) [<802eb6a4>] (__rcu_read_lock) from [<8207c504>] (batadv_nc_process_nc_paths.part.0+0x78/0x1c8 net/batman-adv/network-coding.c:683) [<8207c48c>] (batadv_nc_process_nc_paths.part.0) from [<8207cbd8>] (batadv_nc_process_nc_paths net/batman-adv/network-coding.c:675 [inline]) [<8207c48c>] (batadv_nc_process_nc_paths.part.0) from [<8207cbd8>] (batadv_nc_worker+0x45c/0x470 net/batman-adv/network-coding.c:724) r10:00000088 r9:83822c98 r8:88b05d28 r7:86e88000 r6:83806d00 r5:88b06000 r4:fffffffd [<8207c77c>] (batadv_nc_worker) from [<802696a4>] (process_one_work+0x2d4/0x998 kernel/workqueue.c:2275) r10:00000088 r9:83822c98 r8:83ac7572 r7:86e88000 r6:84420000 r5:84622480 r4:88b05d28 [<802693d0>] (process_one_work) from [<80269dcc>] (worker_thread+0x64/0x54c kernel/workqueue.c:2421) r10:00000088 r9:846d6000 r8:83806d00 r7:84420038 r6:84622494 r5:84420000 r4:84622480 [<80269d68>] (worker_thread) from [<80271f40>] (kthread+0x184/0x1a4 kernel/kthread.c:292) r10:84647e64 r9:84622480 r8:80269d68 r7:00000000 r6:846d6000 r5:8461ae00 r4:84622500 [<80271dbc>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158) Exception stack(0x846d7fb0 to 0x846d7ff8) 7fa0: 00000000 00000000 00000000 00000000 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80271dbc r4:8461ae00