INFO: task syz.3.8159:7192 blocked for more than 430 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.8159 state:D stack:0 pid:7192 tgid:7190 ppid:2670 task_flags:0x400140 flags:0x00000001 Call trace: [<81aea14c>] (__schedule) from [<81aeb560>] (__schedule_loop kernel/sched/core.c:6993 [inline]) [<81aea14c>] (__schedule) from [<81aeb560>] (schedule+0x2c/0x134 kernel/sched/core.c:7008) r10:85f251c0 r9:00000000 r8:85fe3800 r7:851f1c98 r6:ec641bf0 r5:ec641b10 r4:84001880 [<81aeb534>] (schedule) from [<807692c0>] (request_wait_answer fs/fuse/dev.c:585 [inline]) [<81aeb534>] (schedule) from [<807692c0>] (__fuse_request_send fs/fuse/dev.c:599 [inline]) [<81aeb534>] (schedule) from [<807692c0>] (__fuse_simple_request+0x398/0x4f4 fs/fuse/dev.c:693) r5:ec641b10 r4:851f1c40 [<80768f28>] (__fuse_simple_request) from [<8076de3c>] (fuse_simple_request fs/fuse/fuse_i.h:1263 [inline]) [<80768f28>] (__fuse_simple_request) from [<8076de3c>] (fuse_do_statx+0x134/0x3b0 fs/fuse/dir.c:1445) r8:00000003 r7:ec641c40 r6:ec641e90 r5:85877900 r4:ec641b80 [<8076dd08>] (fuse_do_statx) from [<8076ee34>] (fuse_update_get_attr+0xb8/0x1a0 fs/fuse/dir.c:1553) r10:fffff800 r9:00002000 r8:0000088c r7:00002000 r6:ec641e90 r5:85fe3800 r4:85877900 [<8076ed7c>] (fuse_update_get_attr) from [<80770bf0>] (fuse_getattr+0x88/0xa4 fs/fuse/dir.c:2397) r10:00000000 r9:80770b68 r8:82920874 r7:85877900 r6:00000000 r5:ec641e90 r4:0000088c [<80770b68>] (fuse_getattr) from [<8057dbc8>] (vfs_getattr_nosec+0xb0/0x108 fs/stat.c:213) r8:85877900 r7:00002000 r6:0000088c r5:ec641e4c r4:ec641e90 [<8057db18>] (vfs_getattr_nosec) from [<8057dcf8>] (vfs_getattr fs/stat.c:262 [inline]) [<8057db18>] (vfs_getattr_nosec) from [<8057dcf8>] (vfs_statx_path fs/stat.c:299 [inline]) [<8057db18>] (vfs_getattr_nosec) from [<8057dcf8>] (vfs_statx+0x98/0x150 fs/stat.c:356) r9:00000000 r8:83395cc0 r7:ffffff9c r6:00000000 r5:00002900 r4:ec641e90 [<8057dc60>] (vfs_statx) from [<8057e454>] (do_statx+0x74/0xb4 fs/stat.c:761) r10:0000018d r9:84001880 r8:83395cc0 r7:ffffff9c r6:00002900 r5:00000000 r4:0000088c [<8057e3e0>] (do_statx) from [<8057e654>] (__do_sys_statx fs/stat.c:814 [inline]) [<8057e3e0>] (do_statx) from [<8057e654>] (sys_statx+0x5c/0xac fs/stat.c:804) r8:8020029c r7:0000088c r6:ffffff9c r5:83395cc0 r4:00002900 [<8057e5f8>] (sys_statx) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xec641fa8 to 0xec641ff0) 1fa0: 00000000 00000000 ffffff9c 200021c0 00002900 0000088c 1fc0: 00000000 00000000 00346318 0000018d 003462d8 00000000 00000001 76f140dc 1fe0: 76f13e88 76f13e78 00018bc4 00130300 r7:0000018d r6:00346318 r5:00000000 r4:00000000 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 29 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express Call trace: [<80201a14>] (dump_backtrace) from [<80201b08>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:60000193 r6:60000193 r5:822a8688 r4:00000000 [<80201af0>] (show_stack) from [<8021e410>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201af0>] (show_stack) from [<8021e410>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e3b4>] (dump_stack_lvl) from [<8021e43c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:00000113 r5:00000001 r4:00000001 [<8021e424>] (dump_stack) from [<81ad3b7c>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113) [<81ad3a2c>] (nmi_cpu_backtrace) from [<81ad3ccc>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:8280c550 r5:8281afb8 r4:ffffffff [<81ad3b9c>] (nmi_trigger_cpumask_backtrace) from [<8022f124>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:82ac7834 r8:8280c6d8 r7:00067500 r6:84002068 r5:82804d80 r4:00000048 [<8022f10c>] (arch_trigger_cpumask_backtrace) from [<81adb7bc>] (trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]) [<8022f10c>] (arch_trigger_cpumask_backtrace) from [<81adb7bc>] (__sys_info lib/sys_info.c:157 [inline]) [<8022f10c>] (arch_trigger_cpumask_backtrace) from [<81adb7bc>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81adb754>] (sys_info) from [<80385270>] (check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]) [<81adb754>] (sys_info) from [<80385270>] (watchdog+0x59c/0x8d8 kernel/hung_task.c:515) r5:82804d80 r4:85080b14 [<80384cd4>] (watchdog) from [<802814a4>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e60 r8:83103500 r7:00000000 r6:80384cd4 r5:831f8000 r4:8333dc00 [<80281388>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf8d5fb0 to 0xdf8d5ff8) 5fa0: 00000000 00000000 00000000 00000000 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281388 r4:8333dc00 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 9703 Comm: syz.9.8460 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express PC is at uaccess_save_and_enable arch/arm/include/asm/uaccess.h:59 [inline] PC is at do_recvmmsg+0x134/0x2f4 net/socket.c:2955 LR is at ___sys_recvmsg+0x94/0xbc net/socket.c:2855 pc : [<815c6be0>] lr : [<815c6a84>] psr: 60070013 sp : eb339e80 ip : eb339e00 fp : eb339f5c r10: 080002c1 r9 : 84581880 r8 : 00000000 r7 : 00000002 r6 : 00053b31 r5 : 20a76660 r4 : eb339ec0 r3 : b5003500 r2 : 00000000 r1 : 00000000 r0 : 20a7667c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86c096c0 DAC: fffffffd Call trace: [<815c6aac>] (do_recvmmsg) from [<815c9098>] (__sys_recvmmsg net/socket.c:3023 [inline]) [<815c6aac>] (do_recvmmsg) from [<815c9098>] (__do_sys_recvmmsg_time32 net/socket.c:3057 [inline]) [<815c6aac>] (do_recvmmsg) from [<815c9098>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3050) r10:0000016d r9:84581880 r8:080002c1 r7:00000002 r6:00000000 r5:20000040 r4:00000003 [<815c8fd4>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeb339fa8 to 0xeb339ff0) 9fa0: 00000000 00000000 00000003 20000040 080002c1 00000002 9fc0: 00000000 00000000 003463b8 0000016d 00346378 00000000 00000001 76f8e0dc 9fe0: 76f8de88 76f8de78 00018bc4 00130300 r8:8020029c r7:0000016d r6:003463b8 r5:00000000 r4:00000000