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Message-ID: <000000000000edc3690568cc95eb@google.com> Date: Sun, 01 Apr 2018 10:13:01 -0700 From: syzbot <syzbot+6887cbb011c8054e8a3d@...kaller.appspotmail.com> To: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, lizefan@...wei.com, syzkaller-bugs@...glegroups.com Subject: INFO: rcu detected stall in bitmap_parselist Hello, syzbot hit the following crash on upstream commit 3eb2ce825ea1ad89d20f7a3b5780df850e4be274 (Sun Mar 25 22:44:30 2018 +0000) Linux 4.16-rc7 syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=6887cbb011c8054e8a3d So far this crash happened 3 times on upstream. Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5674881425342464 Kernel config: https://syzkaller.appspot.com/x/.config?id=-8440362230543204781 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6887cbb011c8054e8a3d@...kaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. INFO: rcu_sched self-detected stall on CPU 1-....: (124999 ticks this GP) idle=0da/1/4611686018427387906 softirq=49340/49340 fqs=31180 (t=125000 jiffies g=24134 c=24133 q=654) NMI backtrace for cpu 1 CPU: 1 PID: 14671 Comm: syz-executor3 Not tainted 4.16.0-rc7+ #368 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+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 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.61+0xbb8/0x15b0 kernel/rcu/tree.c:1592 __rcu_pending kernel/rcu/tree.c:3361 [inline] rcu_pending kernel/rcu/tree.c:3423 [inline] rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763 update_process_times+0x30/0x60 kernel/time/timer.c:1636 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194 __run_hrtimer kernel/time/hrtimer.c:1349 [inline] __hrtimer_run_queues+0x39c/0xec0 kernel/time/hrtimer.c:1411 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469 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+0xf/0x20 arch/x86/entry/entry_64.S:857 </IRQ> RIP: 0010:__bitmap_parselist+0x2f0/0x4b0 lib/bitmap.c:612 RSP: 0018:ffff88019ef0f6d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12 RAX: 0000000000010000 RBX: 0000000000000001 RCX: ffffffff82af9d1d RDX: 0000000000010000 RSI: ffffc900042fb000 RDI: ffff8801b5a023e0 RBP: ffff88019ef0f750 R08: ffffed0036b4047d R09: ffff8801b5a023e0 R10: 0000000000000001 R11: ffffed0036b4047c R12: 0000000000000008 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 bitmap_parselist+0x3a/0x50 lib/bitmap.c:628 cpulist_parse include/linux/cpumask.h:639 [inline] update_cpumask kernel/cgroup/cpuset.c:974 [inline] cpuset_write_resmask+0x1694/0x2850 kernel/cgroup/cpuset.c:1724 cgroup_file_write+0x2ae/0x710 kernel/cgroup/cgroup.c:3429 kernfs_fop_write+0x2bc/0x440 fs/kernfs/file.c:316 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454879 RSP: 002b:00007f01ef5b4c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f01ef5b56d4 RCX: 0000000000454879 RDX: 0000000000000002 RSI: 0000000020000040 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006a1 R14: 00000000006fbfb8 R15: 0000000000000000 --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@...glegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please 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.
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