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Date: Fri, 22 Dec 2017 15:48:01 -0800 From: syzbot <bot+4e86372b8cb60e44613ff63e5dd1dcaffa7a4d29@...kaller.appspotmail.com> To: Alexey.Brodkin@...opsys.com, andriy.shevchenko@...ux.intel.com, ard.biesheuvel@...aro.org, babu.moger@...cle.com, david@...hnology.com, dzickus@...hat.com, eric@...olt.net, gregkh@...uxfoundation.org, hpa@...or.com, jan.kiszka@...mens.com, jslaby@...e.com, linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, mingo@...hat.com, npiggin@...il.com, phil@...pberrypi.org, rafael.gago@...il.com, sean.wang@...iatek.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org Subject: INFO: rcu detected stall in tty_ioctl syzkaller has found reproducer for the following crash on 37759fa6d0fa9e4d6036d19ac12f555bfc0aeafd 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: rcu_sched self-detected stall on CPU 1-...!: (124998 ticks this GP) idle=1aa/1/4611686018427387906 softirq=6401/6401 fqs=178 (t=125000 jiffies g=3233 c=3232 q=384) rcu_sched kthread starved for 124263 jiffies! g3233 c3232 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_sched R running task 23272 8 2 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+0x13e/0x6f0 kernel/time/timer.c:1818 rcu_gp_kthread+0x9dd/0x18e0 kernel/rcu/tree.c:2231 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 NMI backtrace for cpu 1 CPU: 1 PID: 3169 Comm: syzkaller626814 Not tainted 4.15.0-rc4-mm1+ #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __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_single_cpu_backtrace include/linux/nmi.h:156 [inline] rcu_dump_cpu_stacks+0x186/0x1de kernel/rcu/tree.c:1375 print_cpu_stall kernel/rcu/tree.c:1524 [inline] check_cpu_stall.isra.62+0xbb8/0x15b0 kernel/rcu/tree.c:1592 __rcu_pending kernel/rcu/tree.c:3362 [inline] rcu_pending kernel/rcu/tree.c:3424 [inline] rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2764 update_process_times+0x30/0x60 kernel/time/timer.c:1630 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1148 __run_hrtimer kernel/time/hrtimer.c:1210 [inline] __hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1274 hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1308 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:920 </IRQ> RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:332 [inline] RIP: 0010:inq_canon drivers/tty/n_tty.c:2409 [inline] RIP: 0010:n_tty_ioctl+0x218/0x2d0 drivers/tty/n_tty.c:2429 RSP: 0018:ffff8801c914fb48 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11 RAX: 0000000000000643 RBX: ffffc900018c3060 RCX: ffffffff8293be5c RDX: 0000000000000000 RSI: 00000000749d30db RDI: ffffc900018c4260 RBP: ffff8801c914fb88 R08: 1ffff10039229e99 R09: 0000000000000004 R10: ffff8801c914f988 R11: 0000000000000003 R12: ffffc900018c2000 R13: 00000002e0efd643 R14: 0000000020a6bffc R15: ffff8801c8493938 tty_ioctl+0x336/0x1610 drivers/tty/tty_io.c:2640 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x445b39 RSP: 002b:00007f6ed1479d18 EFLAGS: 00000293 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 0000000000445b39 RDX: 0000000020a6bffc RSI: 000000000000541b RDI: 0000000000000013 RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 6d74702f7665642f R13: 00007ffe16e1657f R14: 00007f6ed147a9c0 R15: 0000000000000008 View attachment "config.txt" of type "text/plain" (126387 bytes) Download attachment "raw.log" of type "application/octet-stream" (10927 bytes) View attachment "repro.txt" of type "text/plain" (797 bytes) Download attachment "repro.c" of type "application/octet-stream" (4132 bytes)
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