INFO: task udevd:28883 blocked for more than 430 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack: 0 pid:28883 ppid: 2029 flags:0x00000001 Backtrace: [<816f4018>] (__schedule) from [<816f49dc>] (schedule+0x4c/0xcc kernel/sched/core.c:6323) r10:8341fb2c r9:5ac3c35a r8:83fe8a90 r7:85487954 r6:8341fa00 r5:836a27d8 r4:8410b980 [<816f4990>] (schedule) from [<8070cae0>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178) r5:836a27d8 r4:836a2c40 [<8070ca74>] (blk_mq_freeze_queue_wait) from [<8070f7c0>] (blk_freeze_queue block/blk-mq.c:205 [inline]) [<8070ca74>] (blk_mq_freeze_queue_wait) from [<8070f7c0>] (blk_mq_freeze_queue+0x1c/0x20 block/blk-mq.c:214) r5:8341fa00 r4:836a27d0 [<8070f7a4>] (blk_mq_freeze_queue) from [<809ee890>] (__loop_clr_fd+0x70/0x430 drivers/block/loop.c:1122) r5:8341fa00 r4:8341fa00 [<809ee820>] (__loop_clr_fd) from [<809eecf4>] (lo_release+0xa4/0xa8 drivers/block/loop.c:1761) r10:8220c44c r9:5ac3c35a r8:83fe8a90 r7:85487954 r6:00000001 r5:8341fb2c r4:8341fa00 [<809eec50>] (lo_release) from [<806f8d1c>] (blkdev_put_whole block/bdev.c:694 [inline]) [<809eec50>] (lo_release) from [<806f8d1c>] (blkdev_put+0xd4/0x278 block/bdev.c:956) r7:85487954 r6:85487900 r5:480a005d r4:82c80440 [<806f8c48>] (blkdev_put) from [<806f9c14>] (blkdev_close+0x18/0x20 block/fops.c:515) r9:5ac3c35a r8:83fe8a90 r7:84addee0 r6:84647ae8 r5:480a005d r4:841b8480 [<806f9bfc>] (blkdev_close) from [<80479074>] (__fput+0x84/0x258 fs/file_table.c:280) [<80478ff0>] (__fput) from [<804792c4>] (____fput+0x10/0x14 fs/file_table.c:313) r9:5ac3c35a r8:0000082c r7:8243d600 r6:8410b980 r5:8410c17c r4:00000000 [<804792b4>] (____fput) from [<802660ec>] (task_work_run+0x9c/0xcc kernel/task_work.c:164) [<80266050>] (task_work_run) from [<8020bc44>] (tracehook_notify_resume include/linux/tracehook.h:189 [inline]) [<80266050>] (task_work_run) from [<8020bc44>] (do_work_pending+0x428/0x51c arch/arm/kernel/signal.c:630) r9:5ac3c35a r8:80200244 r7:fffffe30 r6:80200244 r5:8531ffb0 r4:8410b980 [<8020b81c>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x20) Exception stack(0x8531ffb0 to 0x8531fff8) ffa0: 00000000 7edb1c48 00000003 00000000 ffc0: 76fb687c 76fb6840 00000002 00000006 000563e8 00e16190 00000008 000563f8 ffe0: 000561f4 7edb2448 0002d6d0 76c81380 600f0010 00000008 r10:00000006 r9:8410b980 r8:80200244 r7:00000006 r6:00000002 r5:76fb6840 r4:76fb687c INFO: task syz-executor.0:28892 blocked for more than 430 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack: 0 pid:28892 ppid: 2232 flags:0x00000001 Backtrace: [<816f4018>] (__schedule) from [<816f49dc>] (schedule+0x4c/0xcc kernel/sched/core.c:6323) r10:85487954 r9:4800001f r8:85487958 r7:82b01cbc r6:00000002 r5:8410f300 r4:8410f300 [<816f4990>] (schedule) from [<816f4df4>] (schedule_preempt_disabled+0x10/0x14 kernel/sched/core.c:6382) r5:8410f300 r4:85487954 [<816f4de4>] (schedule_preempt_disabled) from [<816f5ab8>] (__mutex_lock_common kernel/locking/mutex.c:680 [inline]) [<816f4de4>] (schedule_preempt_disabled) from [<816f5ab8>] (__mutex_lock.constprop.0+0x178/0x524 kernel/locking/mutex.c:740) [<816f5940>] (__mutex_lock.constprop.0) from [<816f5f38>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1028) r9:4800001f r8:00000000 r7:85487900 r6:841b8300 r5:4800001f r4:82c80440 [<816f5f24>] (__mutex_lock_slowpath) from [<816f5f78>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:283) [<816f5f3c>] (mutex_lock) from [<806f92b0>] (blkdev_get_by_dev.part.0+0x44/0x2f0 block/bdev.c:819) [<806f926c>] (blkdev_get_by_dev.part.0) from [<806f95a4>] (blkdev_get_by_dev+0x48/0x4c block/bdev.c:803) r10:82b01e50 r9:841b8308 r8:806f9c1c r7:841b8300 r6:841b8300 r5:4800001f r4:00700000 [<806f955c>] (blkdev_get_by_dev) from [<806f9c74>] (blkdev_open+0x58/0x88 block/fops.c:501) r7:841b8300 r6:00000000 r5:84647ae8 r4:841b8300 [<806f9c1c>] (blkdev_open) from [<80472ab8>] (do_dentry_open+0x148/0x3f8 fs/open.c:822) r5:84647ae8 r4:841b8300 [<80472970>] (do_dentry_open) from [<804746d4>] (vfs_open+0x34/0x38 fs/open.c:957) r9:82b01f20 r8:00000000 r7:841b8300 r6:82225d20 r5:00000000 r4:00000002 [<804746a0>] (vfs_open) from [<80488754>] (do_open fs/namei.c:3426 [inline]) [<804746a0>] (vfs_open) from [<80488754>] (path_openat+0x544/0x1034 fs/namei.c:3559) [<80488210>] (path_openat) from [<8048aad0>] (do_filp_open+0x84/0x124 fs/namei.c:3586) r10:00000142 r9:8410f300 r8:82b01e50 r7:00000001 r6:8410f300 r5:82b01f20 r4:82b01f58 [<8048aa4c>] (do_filp_open) from [<804749c4>] (do_sys_openat2+0xa8/0x16c fs/open.c:1212) r8:80200244 r7:ffffff9c r6:00000004 r5:83fa2000 r4:82b01f58 [<8047491c>] (do_sys_openat2) from [<80474e60>] (do_sys_open fs/open.c:1228 [inline]) [<8047491c>] (do_sys_openat2) from [<80474e60>] (__do_sys_openat fs/open.c:1244 [inline]) [<8047491c>] (do_sys_openat2) from [<80474e60>] (sys_openat+0xa4/0xcc fs/open.c:1239) r7:00000142 r6:76fa9ee0 r5:76fa9ee0 r4:ffffff9c [<80474dbc>] (sys_openat) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x82b01fa8 to 0x82b01ff0) 1fa0: 20000248 76faab90 ffffff9c 76fa9ee0 00000002 00000000 1fc0: 20000248 76faab90 76fa9ee0 00000142 00000003 00000000 00085104 00000000 1fe0: 00000000 76fa9e50 00028e6c 00029680 r5:76faab90 r4:20000248 NMI backtrace for cpu 1 CPU: 1 PID: 25 Comm: khungtaskd Not tainted 5.15.0-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<816d743c>] (dump_backtrace) from [<816d7628>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237) r7:8020f468 r6:00000000 r5:60000093 r4:81d5fa2c [<816d7610>] (show_stack) from [<816e019c>] (__dump_stack lib/dump_stack.c:88 [inline]) [<816d7610>] (show_stack) from [<816e019c>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106) [<816e0154>] (dump_stack_lvl) from [<816e01c0>] (dump_stack+0x18/0x1c lib/dump_stack.c:113) r5:00000001 r4:00000013 [<816e01a8>] (dump_stack) from [<8082de4c>] (nmi_cpu_backtrace+0x114/0x180 lib/nmi_backtrace.c:105) [<8082dd38>] (nmi_cpu_backtrace) from [<8082dfc0>] (nmi_trigger_cpumask_backtrace+0x108/0x1a8 lib/nmi_backtrace.c:62) r7:8020f468 r6:8220c494 r5:8220cc70 r4:00000000 [<8082deb8>] (nmi_trigger_cpumask_backtrace) from [<80210754>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:865) r9:000f9001 r8:82204d00 r7:8220c5d4 r6:8221af58 r5:00007f5a r4:82b5cb68 [<8021073c>] (arch_trigger_cpumask_backtrace) from [<803249b0>] (trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]) [<8021073c>] (arch_trigger_cpumask_backtrace) from [<803249b0>] (check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]) [<8021073c>] (arch_trigger_cpumask_backtrace) from [<803249b0>] (watchdog+0x464/0x554 kernel/hung_task.c:295) [<8032454c>] (watchdog) from [<8026972c>] (kthread+0x150/0x16c kernel/kthread.c:327) r10:8294de4c r9:00000000 r8:00000000 r7:8032454c r6:828cf180 r5:828f2280 r4:82a891c0 [<802695dc>] (kthread) from [<80200100>] (ret_from_fork+0x14/0x34 arch/arm/kernel/entry-common.S:146) Exception stack(0x82a23fb0 to 0x82a23ff8) 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 r5:802695dc r4:82a891c0 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2014 Comm: syslogd Not tainted 5.15.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at consume_skb+0x0/0x100 net/core/skbuff.c:907 LR is at skb_free_datagram+0x18/0x6c net/core/datagram.c:325 pc : [<8129b430>] lr : [<8129f450>] psr: 600f0013 sp : 84253db8 ip : 84253dd0 fp : 84253dcc r10: 00000000 r9 : 0000007c r8 : 0000007c r7 : 00000000 r6 : 84003b3c r5 : 84003900 r4 : 84003900 r3 : 00000000 r2 : 00000000 r1 : 8453c000 r0 : 8453c000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 843fed80 DAC: fffffffd CPU: 0 PID: 2014 Comm: syslogd Not tainted 5.15.0-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<816d743c>] (dump_backtrace) from [<816d7628>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237) r7:00000000 r6:84253d68 r5:600f0193 r4:81d5fa2c [<816d7610>] (show_stack) from [<816e019c>] (__dump_stack lib/dump_stack.c:88 [inline]) [<816d7610>] (show_stack) from [<816e019c>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106) [<816e0154>] (dump_stack_lvl) from [<816e01c0>] (dump_stack+0x18/0x1c lib/dump_stack.c:113) r5:00000000 r4:000f0193 [<816e01a8>] (dump_stack) from [<80208d60>] (show_regs+0x14/0x18 arch/arm/kernel/process.c:199) [<80208d4c>] (show_regs) from [<8082de34>] (nmi_cpu_backtrace+0xfc/0x180 lib/nmi_backtrace.c:103) [<8082dd38>] (nmi_cpu_backtrace) from [<8020f8f8>] (do_handle_IPI+0x40/0x34c arch/arm/kernel/smp.c:680) r7:00000000 r6:8368ae00 r5:8280cb80 r4:00000007 [<8020f8b8>] (do_handle_IPI) from [<8020fc24>] (ipi_handler+0x20/0x28 arch/arm/kernel/smp.c:708) r9:8368ae00 r8:0000007c r7:00000017 r6:8220cc8c r5:8280cb80 r4:82885d00 [<8020fc04>] (ipi_handler) from [<802b6d28>] (handle_percpu_devid_irq+0x84/0x25c kernel/irq/chip.c:933) [<802b6ca4>] (handle_percpu_devid_irq) from [<802b0524>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]) [<802b6ca4>] (handle_percpu_devid_irq) from [<802b0524>] (handle_irq_desc kernel/irq/irqdesc.c:646 [inline]) [<802b6ca4>] (handle_percpu_devid_irq) from [<802b0524>] (generic_handle_domain_irq+0x48/0x8c kernel/irq/irqdesc.c:680) r10:00000000 r9:8368ae00 r8:0000007c r7:df80200c r6:8368ae00 r5:00000007 r4:82888000 r3:802b6ca4 [<802b04dc>] (generic_handle_domain_irq) from [<80840b34>] (gic_handle_irq+0x68/0x7c drivers/irqchip/irq-gic.c:372) r7:df80200c r6:820b2e44 r5:df802000 r4:8220cc8c [<80840acc>] (gic_handle_irq) from [<816f2138>] (generic_handle_arch_irq+0x3c/0x4c kernel/irq/handle.c:243) r7:84253d9c r6:00000000 r5:84253d68 r4:820b2e38 [<816f20fc>] (generic_handle_arch_irq) from [<80200abc>] (__irq_svc+0x3c/0x4c arch/arm/kernel/entry-armv.S:202) Exception stack(0x84253d68 to 0x84253db0) 3d60: 8453c000 8453c000 00000000 00000000 84003900 84003900 3d80: 84003b3c 00000000 0000007c 0000007c 00000000 84253dcc 84253dd0 84253db8 3da0: 8129f450 8129b430 600f0013 ffffffff r7:84253d9c r6:ffffffff r5:600f0013 r4:8129b430 [<8129f438>] (skb_free_datagram) from [<8150b17c>] (__unix_dgram_recvmsg+0x278/0x3d0 net/unix/af_unix.c:2383) r5:84003900 r4:8453c000 [<8150af04>] (__unix_dgram_recvmsg) from [<8150b328>] (unix_dgram_recvmsg+0x54/0x5c net/unix/af_unix.c:2401) r10:00000000 r9:8368ae00 r8:00000000 r7:00000000 r6:8306e280 r5:8150b2d4 r4:823bf260 [<8150b2d4>] (unix_dgram_recvmsg) from [<81288f8c>] (sock_recvmsg_nosec net/socket.c:944 [inline]) [<8150b2d4>] (unix_dgram_recvmsg) from [<81288f8c>] (sock_recvmsg net/socket.c:962 [inline]) [<8150b2d4>] (unix_dgram_recvmsg) from [<81288f8c>] (sock_recvmsg net/socket.c:958 [inline]) [<8150b2d4>] (unix_dgram_recvmsg) from [<81288f8c>] (sock_read_iter+0xfc/0x12c net/socket.c:1035) r4:84253ef0 [<81288e90>] (sock_read_iter) from [<80477724>] (call_read_iter include/linux/fs.h:2156 [inline]) [<81288e90>] (sock_read_iter) from [<80477724>] (new_sync_read fs/read_write.c:400 [inline]) [<81288e90>] (sock_read_iter) from [<80477724>] (vfs_read+0x2e8/0x314 fs/read_write.c:481) r7:00004004 r6:84217000 r5:00000000 r4:000000ff [<8047743c>] (vfs_read) from [<80477bf0>] (ksys_read+0xb4/0xec fs/read_write.c:619) r10:00000003 r9:8368ae00 r8:80200244 r7:000000ff r6:000f71b8 r5:84217000 r4:84217000 [<80477b3c>] (ksys_read) from [<80477c38>] (__do_sys_read fs/read_write.c:629 [inline]) [<80477b3c>] (ksys_read) from [<80477c38>] (sys_read+0x10/0x14 fs/read_write.c:627) r7:00000003 r6:76fe0080 r5:000f7190 r4:fffffc00 [<80477c28>] (sys_read) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x84253fa8 to 0x84253ff0) 3fa0: fffffc00 000f7190 00000000 000f71b8 000000ff 00000000 3fc0: fffffc00 000f7190 76fe0080 00000003 00000000 000d6c90 000d6c90 00000000 3fe0: 000d609c 7edc3c88 000579b8 76f046f8