[+Cc linux-crypto] On Sun, Dec 10, 2017 at 05:33:01AM -0800, syzbot wrote: > Hello, > > syzkaller hit the following crash on > 82bcf1def3b5f1251177ad47c44f7e17af039b4b > git://git.cmpxchg.org/linux-mmots.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers > > > INFO: task syzkaller265413:3189 blocked for more than 120 seconds. > Not tainted 4.15.0-rc2-mm1+ #39 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > syzkaller265413 D24320 3189 3150 0x80000000 > 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 > exit_aio+0x47f/0x530 fs/aio.c:903 > __mmput kernel/fork.c:968 [inline] > mmput+0x1b1/0x6c0 kernel/fork.c:992 > exit_mm kernel/exit.c:544 [inline] > do_exit+0x90a/0x1ae0 kernel/exit.c:856 > do_group_exit+0x149/0x400 kernel/exit.c:972 > SYSC_exit_group kernel/exit.c:983 [inline] > SyS_exit_group+0x1d/0x20 kernel/exit.c:981 > entry_SYSCALL_64_fastpath+0x1f/0x96 > RIP: 0033:0x440a99 > RSP: 002b:00007ffc5abebf68 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440a99 > RDX: 0000000000440a99 RSI: 0000000000000058 RDI: 0000000000000000 > RBP: 000000000001cbc8 R08: 000000005abec108 R09: 0000000000401fd0 > R10: 000000005abec108 R11: 0000000000000202 R12: 0000000000000000 > R13: 0000000000401fd0 R14: 0000000000000000 R15: 0000000000000000 > > Showing all locks held in the system: > 2 locks held by khungtaskd/673: > #0: (rcu_read_lock){....}, at: [<00000000a9ed5249>] > check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] > #0: (rcu_read_lock){....}, at: [<00000000a9ed5249>] watchdog+0x1c5/0xd60 > kernel/hung_task.c:249 > #1: (tasklist_lock){.+.+}, at: [<0000000036eecee2>] > debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 > 2 locks held by getty/3117: > #0: (&tty->ldisc_sem){++++}, at: [<000000008d3f9495>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fafb010f>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3118: > #0: (&tty->ldisc_sem){++++}, at: [<000000008d3f9495>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fafb010f>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3119: > #0: (&tty->ldisc_sem){++++}, at: [<000000008d3f9495>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fafb010f>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3120: > #0: (&tty->ldisc_sem){++++}, at: [<000000008d3f9495>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fafb010f>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3121: > #0: (&tty->ldisc_sem){++++}, at: [<000000008d3f9495>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fafb010f>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3122: > #0: (&tty->ldisc_sem){++++}, at: [<000000008d3f9495>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fafb010f>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > 2 locks held by getty/3123: > #0: (&tty->ldisc_sem){++++}, at: [<000000008d3f9495>] > ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 > #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000fafb010f>] > n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 > > ============================================= > > NMI backtrace for cpu 1 > CPU: 1 PID: 673 Comm: khungtaskd Not tainted 4.15.0-rc2-mm1+ #39 > 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 1 to CPUs 0: > NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 > arch/x86/include/asm/irqflags.h:54 > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > Please credit me with: Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx> > > 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 > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report Still happening occasionally, but the reproducer is using AF_ALG with the "rfc4309(pcrypt(pcrypt(rfc4106(gcm(aes)))))" algorithm which means it's very likely a duplicate of the recursive pcrypt bug, main thread here: https://groups.google.com/d/msg/syzkaller-bugs/1_CXUd3gBcg/BvsRLH0lAgAJ #syz dup: INFO: task hung in aead_recvmsg - Eric
