INFO: task syz-executor.1:27514 blocked for more than 430 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack: 0 pid:27514 ppid: 2263 flags:0x00000001 Backtrace: [<81712400>] (__schedule) from [<81712e58>] (schedule+0x54/0xdc kernel/sched/core.c:6326) r10:835cdb00 r9:82c84880 r8:8220c920 r7:8220c5b8 r6:8220c490 r5:835cdb08 r4:835da280 [<81712e04>] (schedule) from [<8071abf4>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178) r5:835cdb08 r4:835cdf70 [<8071ab88>] (blk_mq_freeze_queue_wait) from [<807283a0>] (del_gendisk+0x17c/0x20c block/genhd.c:623) r5:838dd300 r4:00000008 [<80728224>] (del_gendisk) from [<809fc00c>] (loop_remove+0x20/0x58 drivers/block/loop.c:2080) r10:83892408 r9:00000003 r8:854f0300 r7:00000000 r6:83868b2c r5:8234b6b0 r4:83868a00 r3:835da280 [<809fbfec>] (loop_remove) from [<809fc670>] (loop_control_remove drivers/block/loop.c:2137 [inline]) [<809fbfec>] (loop_remove) from [<809fc670>] (loop_control_ioctl+0x1d8/0x1fc drivers/block/loop.c:2175) r5:83868a00 r4:00000000 [<809fc498>] (loop_control_ioctl) from [<804990a8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<809fc498>] (loop_control_ioctl) from [<804990a8>] (do_vfs_ioctl fs/ioctl.c:834 [inline]) [<809fc498>] (loop_control_ioctl) from [<804990a8>] (__do_sys_ioctl fs/ioctl.c:872 [inline]) [<809fc498>] (loop_control_ioctl) from [<804990a8>] (sys_ioctl+0x110/0xaa0 fs/ioctl.c:860) r6:854f0301 r5:00000000 r4:00004c81 [<80498f98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x85181fa8 to 0x85181ff0) 1fa0: 00000000 00000000 00000003 00004c81 00000000 00000000 1fc0: 00000000 00000000 00000000 00000036 7ef8c31a 76f6f6d0 7ef8c4a4 76f6f20c 1fe0: 76f6f048 76f6f038 00018e9c 0004ba40 r10:00000036 r9:835da280 r8:80200244 r7:00000036 r6:00000000 r5:00000000 r4:00000000 NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<816f56d0>] (dump_backtrace) from [<816f58bc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237) r7:00000000 r6:00000000 r5:60000093 r4:81d6017c [<816f58a4>] (show_stack) from [<816fe314>] (__dump_stack lib/dump_stack.c:88 [inline]) [<816f58a4>] (show_stack) from [<816fe314>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106) [<816fe2cc>] (dump_stack_lvl) from [<816fe338>] (dump_stack+0x18/0x1c lib/dump_stack.c:113) r5:00000013 r4:00000000 [<816fe320>] (dump_stack) from [<8083cd6c>] (nmi_cpu_backtrace+0x114/0x180 lib/nmi_backtrace.c:105) [<8083cc58>] (nmi_cpu_backtrace) from [<8083ceec>] (nmi_trigger_cpumask_backtrace+0x114/0x1d0 lib/nmi_backtrace.c:62) r7:00000000 r6:8220c494 r5:8220cc70 r4:00000000 [<8083cdd8>] (nmi_trigger_cpumask_backtrace) from [<80210c54>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:865) r9:000a6240 r8:82204d00 r7:00007f63 r6:824839b0 r5:8220c5d4 r4:8346c840 [<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329f7c>] (trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]) [<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329f7c>] (check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]) [<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329f7c>] (watchdog+0x4a0/0x58c kernel/hung_task.c:295) [<80329adc>] (watchdog) from [<8026a518>] (kthread+0x164/0x198 kernel/kthread.c:327) r10:8294de4c r9:00000000 r8:00000000 r7:80329adc r6:828cf180 r5:82a89240 r4:828f2e00 [<8026a3b4>] (kthread) from [<80200100>] (ret_from_fork+0x14/0x34 arch/arm/kernel/entry-common.S:146) Exception stack(0x82a25fb0 to 0x82a25ff8) 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 r5:8026a3b4 r4:82a89240 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2019 Comm: klogd Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: ARM-Versatile Express PC is at __aeabi_uidivmod+0x0/0x18 arch/arm/lib/lib1funcs.S:337 LR is at __check_heap_object+0x48/0xf4 mm/slub.c:4508 pc : [<80831f3c>] lr : [<80463164>] psr: 800f0013 sp : 840bdd58 ip : 840bdd58 fp : 840bdd84 r10: 84429240 r9 : 840bdeb8 r8 : 8403f400 r7 : dde898b8 r6 : 00000000 r5 : 0000004b r4 : 82801b40 r3 : 00080000 r2 : 8248c700 r1 : 00000200 r0 : 00001400 Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 82afd180 DAC: 00000000 CPU: 1 PID: 2019 Comm: klogd Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<816f56d0>] (dump_backtrace) from [<816f58bc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237) r7:00000017 r6:840bdd08 r5:600f0193 r4:81d6017c [<816f58a4>] (show_stack) from [<816fe314>] (__dump_stack lib/dump_stack.c:88 [inline]) [<816f58a4>] (show_stack) from [<816fe314>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106) [<816fe2cc>] (dump_stack_lvl) from [<816fe338>] (dump_stack+0x18/0x1c lib/dump_stack.c:113) r5:000f0193 r4:00000001 [<816fe320>] (dump_stack) from [<80209080>] (show_regs+0x14/0x18 arch/arm/kernel/process.c:199) [<8020906c>] (show_regs) from [<8083cd54>] (nmi_cpu_backtrace+0xfc/0x180 lib/nmi_backtrace.c:103) [<8083cc58>] (nmi_cpu_backtrace) from [<8020fd58>] (do_handle_IPI+0x4c/0x3b4 arch/arm/kernel/smp.c:680) r7:00000017 r6:00000001 r5:8280cb80 r4:00000007 [<8020fd0c>] (do_handle_IPI) from [<802100e0>] (ipi_handler+0x20/0x28 arch/arm/kernel/smp.c:708) r9:83de8000 r8:840bdc70 r7:00000017 r6:8220cc8c r5:8280cb80 r4:82885d00 [<802100c0>] (ipi_handler) from [<802b9530>] (handle_percpu_devid_irq+0x9c/0x2d4 kernel/irq/chip.c:933) [<802b9494>] (handle_percpu_devid_irq) from [<802b2ba0>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]) [<802b9494>] (handle_percpu_devid_irq) from [<802b2ba0>] (handle_irq_desc kernel/irq/irqdesc.c:646 [inline]) [<802b9494>] (handle_percpu_devid_irq) from [<802b2ba0>] (generic_handle_domain_irq+0x48/0x8c kernel/irq/irqdesc.c:680) r10:84429240 r9:83de8000 r8:00000000 r7:df80200c r6:83de8000 r5:00000007 r4:82888000 r3:802b9494 [<802b2b58>] (generic_handle_domain_irq) from [<8084fa80>] (gic_handle_irq+0x68/0x7c drivers/irqchip/irq-gic.c:372) r7:df80200c r6:820a5fc4 r5:df802000 r4:8220cc8c [<8084fa18>] (gic_handle_irq) from [<81710264>] (generic_handle_arch_irq+0x60/0x80 kernel/irq/handle.c:243) r7:840bdd08 r6:81f092c0 r5:81f092d8 r4:820a5fb8 [<81710204>] (generic_handle_arch_irq) from [<80200abc>] (__irq_svc+0x3c/0x64 arch/arm/kernel/entry-armv.S:202) Exception stack(0x840bdd08 to 0x840bdd50) dd00: 00001400 00000200 8248c700 00080000 82801b40 0000004b dd20: 00000000 dde898b8 8403f400 840bdeb8 84429240 840bdd84 840bdd58 840bdd58 dd40: 80463164 80831f3c 800f0013 ffffffff r9:83de8000 r8:8403f400 r7:840bdd3c r6:ffffffff r5:800f0013 r4:80831f3c [<8046311c>] (__check_heap_object) from [<8047b2cc>] (check_heap_object mm/usercopy.c:240 [inline]) [<8046311c>] (__check_heap_object) from [<8047b2cc>] (__check_object_size mm/usercopy.c:286 [inline]) [<8046311c>] (__check_heap_object) from [<8047b2cc>] (__check_object_size+0x1a4/0x208 mm/usercopy.c:256) r8:8403f400 r7:8403f44b r6:00000000 r5:0000004b r4:8403f400 [<8047b128>] (__check_object_size) from [<812b3e6c>] (check_object_size include/linux/thread_info.h:185 [inline]) [<8047b128>] (__check_object_size) from [<812b3e6c>] (check_copy_size include/linux/thread_info.h:218 [inline]) [<8047b128>] (__check_object_size) from [<812b3e6c>] (copy_from_iter include/linux/uio.h:161 [inline]) [<8047b128>] (__check_object_size) from [<812b3e6c>] (skb_copy_datagram_from_iter+0x60/0x238 net/core/datagram.c:559) r10:84429240 r9:840bdeb8 r8:8403f400 r7:0000004b r6:00000000 r5:0000004b r4:0000004b [<812b3e0c>] (skb_copy_datagram_from_iter) from [<8152562c>] (unix_dgram_sendmsg+0x360/0x8f4 net/unix/af_unix.c:1824) r10:84429240 r9:00000000 r8:8345f300 r7:8345fc00 r6:0000004b r5:8308b400 r4:840bdeb0 [<815252cc>] (unix_dgram_sendmsg) from [<8129dcc8>] (sock_sendmsg_nosec net/socket.c:704 [inline]) [<815252cc>] (unix_dgram_sendmsg) from [<8129dcc8>] (sock_sendmsg+0x3c/0x4c net/socket.c:724) r10:00000121 r9:83de8000 r8:80200244 r7:00004000 r6:00000000 r5:8308b400 r4:840bdeb0 [<8129dc8c>] (sock_sendmsg) from [<8129fc14>] (__sys_sendto+0xcc/0x118 net/socket.c:2036) r5:8308b400 r4:00000000 [<8129fb48>] (__sys_sendto) from [<8129fca4>] (__do_sys_send net/socket.c:2058 [inline]) [<8129fb48>] (__sys_sendto) from [<8129fca4>] (sys_send+0x20/0x28 net/socket.c:2055) r7:00000121 r6:00000001 r5:76fed080 r4:0135b190 [<8129fc84>] (sys_send) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x840bdfa8 to 0x840bdff0) dfa0: 0135b190 76fed080 00000003 01363470 0000004b 00004000 dfc0: 0135b190 76fed080 00000001 00000121 7ed22cc0 00000000 76fed080 00000000 dfe0: 00000000 7ed22bf8 76f1eb88 76f23e78