From: Dmitry Vyukov Subject: Re: INFO: task hung in aead_recvmsg Date: Tue, 12 Dec 2017 17:46:46 +0100 Message-ID: References: <001a1140b8307b0439055ffc7872@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Cc: LKML , Ingo Molnar , Peter Zijlstra , syzkaller-bugs@googlegroups.com, Herbert Xu , David Miller , linux-crypto@vger.kernel.org, Eric Biggers To: syzbot Return-path: Received: from mail-pf0-f193.google.com ([209.85.192.193]:34097 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751641AbdLLQrI (ORCPT ); Tue, 12 Dec 2017 11:47:08 -0500 Received: by mail-pf0-f193.google.com with SMTP id a90so14623852pfk.1 for ; Tue, 12 Dec 2017 08:47:08 -0800 (PST) In-Reply-To: <001a1140b8307b0439055ffc7872@google.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: On Sun, Dec 10, 2017 at 2:34 PM, syzbot wrote: > Hello, > > syzkaller hit the following crash on > ad4dac17f9d563b9e34aab78a34293b10993e9b5 > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > > Unfortunately, I don't have any reproducer for this bug yet. > > > Use struct sctp_assoc_value instead > INFO: task syz-executor6:7377 blocked for more than 120 seconds. > Not tainted 4.15.0-rc2-next-20171208+ #63 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > syz-executor6 D24416 7377 3393 0x00000004 > Call Trace: > context_switch kernel/sched/core.c:2800 [inline] > __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 > schedule+0xf5/0x430 kernel/sched/core.c:3435 > schedule_timeout+0x43a/0x560 kernel/time/timer.c:1776 > do_wait_for_common kernel/sched/completion.c:91 [inline] > __wait_for_common kernel/sched/completion.c:112 [inline] > wait_for_common kernel/sched/completion.c:123 [inline] > wait_for_completion+0x44b/0x7b0 kernel/sched/completion.c:144 > crypto_wait_req include/linux/crypto.h:496 [inline] > _aead_recvmsg crypto/algif_aead.c:308 [inline] > aead_recvmsg+0x1396/0x1bc0 crypto/algif_aead.c:329 > aead_recvmsg_nokey+0x60/0x80 crypto/algif_aead.c:447 > sock_recvmsg_nosec net/socket.c:809 [inline] > sock_recvmsg+0xc9/0x110 net/socket.c:816 > ___sys_recvmsg+0x29b/0x630 net/socket.c:2185 > __sys_recvmsg+0xe2/0x210 net/socket.c:2230 > SYSC_recvmsg net/socket.c:2242 [inline] > SyS_recvmsg+0x2d/0x50 net/socket.c:2237 > entry_SYSCALL_64_fastpath+0x1f/0x96 > RIP: 0033:0x452a39 > RSP: 002b:00007f9dc7c93c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f > RAX: ffffffffffffffda RBX: 00007f9dc7c94700 RCX: 0000000000452a39 > RDX: 0000000000000000 RSI: 0000000020539fc8 RDI: 0000000000000025 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 > R13: 0000000000a6f7ff R14: 00007f9dc7c949c0 R15: 0000000000000000 > > Showing all locks held in the system: > 2 locks held by khungtaskd/671: > #0: (rcu_read_lock){....}, at: [<00000000d256784e>] > check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] > #0: (rcu_read_lock){....}, at: [<00000000d256784e>] watchdog+0x1c5/0xd60 > kernel/hung_task.c:249 > #1: (tasklist_lock){.+.+}, at: [<00000000d84da0f3>] > debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 > 1 lock held by rsyslogd/2995: > #0: (&f->f_pos_lock){+.+.}, at: [<0000000034bb33fc>] > __fdget_pos+0x131/0x1a0 fs/file.c:765 > 2 locks held by getty/3116: > #0: (&tty->ldisc_sem){++++}, at: [<000000008df66e53>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000870ebf25>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3117: > #0: (&tty->ldisc_sem){++++}, at: [<000000008df66e53>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000870ebf25>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3118: > #0: (&tty->ldisc_sem){++++}, at: [<000000008df66e53>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000870ebf25>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3119: > #0: (&tty->ldisc_sem){++++}, at: [<000000008df66e53>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000870ebf25>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3120: > #0: (&tty->ldisc_sem){++++}, at: [<000000008df66e53>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000870ebf25>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3121: > #0: (&tty->ldisc_sem){++++}, at: [<000000008df66e53>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000870ebf25>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3122: > #0: (&tty->ldisc_sem){++++}, at: [<000000008df66e53>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000870ebf25>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 1 lock held by syz-executor6/7377: > #0: (sk_lock-AF_ALG){+.+.}, at: [<0000000096d0e030>] lock_sock > include/net/sock.h:1463 [inline] > #0: (sk_lock-AF_ALG){+.+.}, at: [<0000000096d0e030>] > aead_recvmsg+0xb3/0x1bc0 crypto/algif_aead.c:327 > 1 lock held by syz-executor6/7391: > #0: (sk_lock-AF_ALG){+.+.}, at: [<0000000096d0e030>] lock_sock > include/net/sock.h:1463 [inline] > #0: (sk_lock-AF_ALG){+.+.}, at: [<0000000096d0e030>] > aead_recvmsg+0xb3/0x1bc0 crypto/algif_aead.c:327 > > ============================================= > > NMI backtrace for cpu 0 > CPU: 0 PID: 671 Comm: khungtaskd Not tainted 4.15.0-rc2-next-20171208+ #63 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x257 lib/dump_stack.c:53 > nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 > nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62 > arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 > trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] > check_hung_task kernel/hung_task.c:132 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] > watchdog+0x90c/0xd60 kernel/hung_task.c:249 > kthread+0x37a/0x440 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 > Sending NMI from CPU 0 to CPUs 1: > NMI backtrace for cpu 1 > CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc2-next-20171208+ #63 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 > [inline] > RIP: 0010:lock_pin_lock+0x2b7/0x370 kernel/locking/lockdep.c:4064 > RSP: 0018:ffff8801db307470 EFLAGS: 00000086 > RAX: dffffc0000000000 RBX: ffff8801d9f88300 RCX: ffffffff82501583 > RDX: 1ffffffff0c59759 RSI: ffff8801db32c918 RDI: 0000000000000082 > RBP: ffff8801db3074b8 R08: ffff8801db306f88 R09: ffff8801d9f88300 > R10: 000000000000000b R11: ffffed003b660df3 R12: ffff8801d9f88300 > R13: ffffed003b3f1170 R14: ffff8801db32c918 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000c446de3010 CR3: 00000001cc38e000 CR4: 00000000001406e0 > DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 > Call Trace: > > rq_pin_lock kernel/sched/sched.h:932 [inline] > rq_lock_irqsave kernel/sched/sched.h:1751 [inline] > update_blocked_averages+0x195/0x1b60 kernel/sched/fair.c:7353 > rebalance_domains+0x145/0xcc0 kernel/sched/fair.c:9122 > run_rebalance_domains+0x381/0x780 kernel/sched/fair.c:9383 > __do_softirq+0x29d/0xbb2 kernel/softirq.c:285 > invoke_softirq kernel/softirq.c:365 [inline] > irq_exit+0x1d3/0x210 kernel/softirq.c:405 > scheduler_ipi+0x32a/0x830 kernel/sched/core.c:1804 > smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277 > reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:944 > > RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 > RSP: 0018:ffff8801d9f97da8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 > RAX: dffffc0000000000 RBX: 1ffff1003b3f2fb8 RCX: 0000000000000000 > RDX: 1ffffffff0c5975c RSI: 0000000000000001 RDI: ffffffff862cbae0 > RBP: ffff8801d9f97da8 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 > R13: ffff8801d9f97e60 R14: ffffffff869efaa0 R15: 0000000000000000 > arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline] > default_idle+0xbf/0x430 arch/x86/kernel/process.c:355 > arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:346 > default_idle_call+0x36/0x90 kernel/sched/idle.c:98 > cpuidle_idle_call kernel/sched/idle.c:156 [inline] > do_idle+0x24a/0x3b0 kernel/sched/idle.c:246 > cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351 > start_secondary+0x330/0x460 arch/x86/kernel/smpboot.c:277 > secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 > Code: ff df c7 83 84 08 00 00 00 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 > 0f 85 91 00 00 00 48 83 3d 37 78 d7 04 00 74 45 48 8b 7d c0 <57> 9d 0f 1f 44 > 00 00 8b 45 cc 48 83 c4 20 5b 41 5c 41 5d 41 5e +crypto maintainers this is crypto, not sched > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@googlegroups.com. > Please credit me with: Reported-by: syzbot > > syzbot will keep track of this bug report. > Once a fix for this bug is merged into any tree, reply to this email with: > #syz fix: exact-commit-title > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/001a1140b8307b0439055ffc7872%40google.com. > For more options, visit https://groups.google.com/d/optout.