INFO: task syz-executor.2:30150 can't die for more than 143 seconds. task:syz-executor.2 state:D stack:24560 pid:30150 ppid: 3627 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5043 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6352 schedule+0xd2/0x1f0 kernel/sched/core.c:6424 __lock_sock+0x13d/0x260 net/core/sock.c:2770 lock_sock_nested+0xd6/0xf0 net/core/sock.c:3317 lock_sock include/net/sock.h:1682 [inline] sctp_wait_for_connect+0x1e0/0x5d0 net/sctp/socket.c:9318 sctp_sendmsg_to_asoc+0x1810/0x2360 net/sctp/socket.c:1881 sctp_sendmsg+0x104d/0x1d40 net/sctp/socket.c:2027 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 __sys_sendto+0x21c/0x320 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] __se_sys_sendto net/socket.c:2048 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2048 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f565ea89049 RSP: 002b:00007f565fbe5168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f565eb9bf60 RCX: 00007f565ea89049 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f565eae308d R08: 0000000020000240 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc138dc7f R14: 00007f565fbe5300 R15: 0000000000022000 INFO: task syz-executor.2:30150 blocked for more than 143 seconds. Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:24560 pid:30150 ppid: 3627 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5043 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6352 schedule+0xd2/0x1f0 kernel/sched/core.c:6424 __lock_sock+0x13d/0x260 net/core/sock.c:2770 lock_sock_nested+0xd6/0xf0 net/core/sock.c:3317 lock_sock include/net/sock.h:1682 [inline] sctp_wait_for_connect+0x1e0/0x5d0 net/sctp/socket.c:9318 sctp_sendmsg_to_asoc+0x1810/0x2360 net/sctp/socket.c:1881 sctp_sendmsg+0x104d/0x1d40 net/sctp/socket.c:2027 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 __sys_sendto+0x21c/0x320 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] __se_sys_sendto net/socket.c:2048 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2048 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f565ea89049 RSP: 002b:00007f565fbe5168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f565eb9bf60 RCX: 00007f565ea89049 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f565eae308d R08: 0000000020000240 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc138dc7f R14: 00007f565fbe5300 R15: 0000000000022000 INFO: task syz-executor.2:30162 can't die for more than 144 seconds. task:syz-executor.2 state:R running task stack:25616 pid:30162 ppid: 3627 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5043 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6352 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6660 Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8bd858e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6498 2 locks held by getty/3276: #0: ffff88801d9f1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002e632e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2075 1 lock held by syz-executor.2/30150: #0: ffff88801d76d8b0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1682 [inline] #0: ffff88801d76d8b0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: sctp_wait_for_connect+0x1e0/0x5d0 net/sctp/socket.c:9318 1 lock held by syz-executor.2/30162: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:256 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:413 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 30162 Comm: syz-executor.2 Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:200 Code: 4a 00 5d be 03 00 00 00 e9 96 96 74 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 29 49 89 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 70 02 00 a9 RSP: 0018:ffffc900049ff808 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888030a3d7c0 RDI: 0000000000000003 RBP: ffff8880242f812e R08: 0000000000000000 R09: ffffffff8882f369 R10: ffffffff8882f381 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f565fbc4700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562e2c83a680 CR3: 0000000079083000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __sctp_auth_cid+0x123/0x160 net/sctp/auth.c:645 sctp_auth_recv_cid+0x6f/0xa0 net/sctp/auth.c:694 sctp_assoc_bh_rcv+0x1b1/0x6c0 net/sctp/associola.c:1035 sctp_inq_push+0x1d2/0x270 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x196/0x5a0 net/sctp/input.c:344 sk_backlog_rcv include/net/sock.h:1051 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2794 release_sock+0x54/0x1b0 net/core/sock.c:3327 sctp_sendmsg+0x1070/0x1d40 net/sctp/socket.c:2032 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 sock_write_iter+0x289/0x3c0 net/socket.c:1061 call_write_iter include/linux/fs.h:2082 [inline] new_sync_write+0x431/0x660 fs/read_write.c:504 vfs_write+0x7c9/0xad0 fs/read_write.c:591 ksys_write+0x1ee/0x250 fs/read_write.c:644 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f565ea89049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f565fbc4168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f565eb9c030 RCX: 00007f565ea89049 RDX: 0000000000019fff RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f565eae308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc138dc7f R14: 00007f565fbc4300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 4a 00 5d be rex.WX add %bl,-0x42(%rbp) 4: 03 00 add (%rax),%eax 6: 00 00 add %al,(%rax) 8: e9 96 96 74 02 jmpq 0x27496a3 d: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 13: 48 8b be b0 01 00 00 mov 0x1b0(%rsi),%rdi 1a: e8 b4 ff ff ff callq 0xffffffd3 1f: 31 c0 xor %eax,%eax 21: c3 retq 22: 90 nop 23: 65 8b 05 29 49 89 7e mov %gs:0x7e894929(%rip),%eax # 0x7e894953 * 2a: 89 c1 mov %eax,%ecx <-- trapping instruction 2c: 48 8b 34 24 mov (%rsp),%rsi 30: 81 e1 00 01 00 00 and $0x100,%ecx 36: 65 48 8b 14 25 00 70 mov %gs:0x27000,%rdx 3d: 02 00 3f: a9 .byte 0xa9