INFO: task syz.8.71611:26541 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.8.71611 state:D stack:0 pid:26541 tgid:26538 ppid:10514 task_flags:0x400040 flags:0x00000001 Call trace: [<81a3c05c>] (__schedule) from [<81a3cff0>] (__schedule_loop kernel/sched/core.c:7043 [inline]) [<81a3c05c>] (__schedule) from [<81a3cff0>] (schedule+0x2c/0x130 kernel/sched/core.c:7058) r10:dfdf1ecc r9:dfdf1e50 r8:849cac40 r7:84ed9740 r6:84ed9834 r5:84ed9740 r4:862f6c00 [<81a3cfc4>] (schedule) from [<8154b540>] (__lock_sock+0x68/0xac net/core/sock.c:3170) r5:84ed9740 r4:84ed982c [<8154b4d8>] (__lock_sock) from [<8154b668>] (lock_sock_nested net/core/sock.c:3738 [inline]) [<8154b4d8>] (__lock_sock) from [<8154b668>] (lock_sock include/net/sock.h:1667 [inline]) [<8154b4d8>] (__lock_sock) from [<8154b668>] (sockopt_lock_sock net/core/sock.c:1146 [inline]) [<8154b4d8>] (__lock_sock) from [<8154b668>] (sockopt_lock_sock+0x54/0x58 net/core/sock.c:1137) r6:00000000 r5:84ed982c r4:84ed9740 [<8154b614>] (sockopt_lock_sock) from [<81744f6c>] (do_tcp_setsockopt+0x398/0xc5c net/ipv4/tcp.c:3895) r5:00000004 r4:00000014 [<81744bd8>] (do_tcp_setsockopt) from [<81745880>] (tcp_setsockopt+0x50/0x58 net/ipv4/tcp.c:4112) r10:00000126 r9:862f6c00 r8:00000004 r7:837e3400 r6:00000014 r5:00000006 r4:81745830 [<81745834>] (tcp_setsockopt) from [<81546ee8>] (sock_common_setsockopt+0x38/0x40 net/core/sock.c:3925) r4:81745830 [<81546eb4>] (sock_common_setsockopt) from [<81542588>] (do_sock_setsockopt+0x70/0xc8 net/socket.c:2344) r4:81546eb0 [<81542518>] (do_sock_setsockopt) from [<81545b40>] (__sys_setsockopt+0x7c/0xc4 net/socket.c:2369) r8:00000000 r7:869cbb40 r6:869cbb41 r5:00000014 r4:00000006 [<81545ac4>] (__sys_setsockopt) from [<81545ba4>] (__do_sys_setsockopt net/socket.c:2375 [inline]) [<81545ac4>] (__sys_setsockopt) from [<81545ba4>] (sys_setsockopt+0x1c/0x24 net/socket.c:2372) r8:8020029c r7:00000126 r6:002f63b0 r5:00000000 r4:00000004 [<81545b88>] (sys_setsockopt) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdf1fa8 to 0xdfdf1ff0) 1fa0: 00000004 00000000 00000003 00000006 00000014 20000100 1fc0: 00000004 00000000 002f63b0 00000126 002e0000 00000000 00006364 76f430bc 1fe0: 76f42ec0 76f42eb0 0001948c 001322c0 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express Call trace: [<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:00000000 r6:000e0013 r5:600e0093 r4:8226023c [<80201b08>] (show_stack) from [<8021fb90>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201b08>] (show_stack) from [<8021fb90>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120) [<8021fb20>] (dump_stack_lvl) from [<8021fbb4>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r5:00000000 r4:00000001 [<8021fb9c>] (dump_stack) from [<81a25c70>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<81a25b10>] (nmi_cpu_backtrace) from [<81a25dbc>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000000 r6:8280c690 r5:8281ac94 r4:ffffffff [<81a25c8c>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:82abd564 r8:82804d40 r7:000fac40 r6:00007eef r5:8281b248 r4:8606ec0c [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d980>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d980>] (check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d980>] (watchdog+0x4d4/0x81c kernel/hung_task.c:491) [<8037d4ac>] (watchdog) from [<80281fc8>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:00000000 r8:8037d4ac r7:832a0300 r6:832a0300 r5:832e4800 r4:00000001 [<80281e9c>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf8e1fb0 to 0xdf8e1ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281e9c r4:833c1800 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 29049 Comm: syz.5.72657 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at mas_is_start lib/maple_tree.c:279 [inline] PC is at mas_walk+0x324/0x3bc lib/maple_tree.c:4940 LR is at 0x8604f400 pc : [<81a179fc>] lr : [<8604f400>] psr: 60000113 sp : dff49e70 ip : dff49eb0 fp : dff49eac r10: 860dce0c r9 : 10c1b9c1 r8 : 860dce80 r7 : 0000000a r6 : 860dce00 r5 : 20003000 r4 : 00000019 r3 : 20000000 r2 : 00000000 r1 : 20ffffff r0 : 85eabf00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 855acdc0 DAC: 00000000 Call trace: [<81a176d8>] (mas_walk) from [<804bd5a8>] (lock_vma_under_rcu+0x68/0x148 mm/mmap_lock.c:143) r10:00000002 r9:8604f400 r8:00000255 r7:855f5400 r6:8604f400 r5:20003000 r4:dff49fb0 [<804bd540>] (lock_vma_under_rcu) from [<802342c8>] (do_page_fault+0x1a0/0x49c arch/arm/mm/fault.c:317) r6:00000a06 r5:20003000 r4:dff49fb0 [<80234128>] (do_page_fault) from [<80234744>] (do_translation_fault+0xfc/0x12c arch/arm/mm/fault.c:475) r10:fffffffe r9:002f62dc r8:80234648 r7:dff49fb0 r6:20003000 r5:00000a06 r4:8281cee0 [<80234648>] (do_translation_fault) from [<802347ac>] (do_DataAbort+0x38/0xa8 arch/arm/mm/fault.c:596) r9:002f62dc r8:80234648 r7:dff49fb0 r6:20003000 r5:00000a06 r4:8281cee0 [<80234774>] (do_DataAbort) from [<80200edc>] (__dabt_usr+0x5c/0x60 arch/arm/kernel/entry-armv.S:434) Exception stack(0xdff49fb0 to 0xdff49ff8) 9fa0: 00000000 00000000 00000001 20003000 9fc0: 01b92540 00000000 00000000 00000000 00000000 002f62dc fffffffe 00000000 9fe0: 01b925b8 7ef157d0 00020bf8 00020f88 40000010 ffffffff r8:826b7044 r7:855f5400 r6:ffffffff r5:40000010 r4:00020f88