On Sun, Apr 1, 2018 at 7:13 PM, syzbot <syzbot+c479aeac880b090ceeb2@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot hit the following crash on upstream commit > cb6416592bc2a8b731dabcec0d63cda270764fc6 (Sun Mar 25 17:45:10 2018 +0000) > Merge tag 'dmaengine-fix-4.16-rc7' of > git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/slave-dma > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=c479aeac880b090ceeb2 > > 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=5205501092560896 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=-5034017172441945317 > compiler: gcc (GCC) 7.1.1 20170620 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+c479aeac880b090ceeb2@xxxxxxxxxxxxxxxxxxxxxxxxx > 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. #syz dup: INFO: rcu detected stall in bitmap_parselist > INFO: rcu_sched self-detected stall on CPU > 1-....: (124999 ticks this GP) idle=1ca/1/4611686018427387906 > softirq=17365/17365 fqs=31238 > (t=125000 jiffies g=7965 c=7964 q=402) > NMI backtrace for cpu 1 > CPU: 1 PID: 6633 Comm: syz-executor6 Not tainted 4.16.0-rc6+ #366 > 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:__read_once_size include/linux/compiler.h:188 [inline] > RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:106 > RSP: 0018:ffff8801ce8ef680 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12 > RAX: 0000000000010000 RBX: ffffffffffffff80 RCX: ffffffff825ae73d > RDX: 000000000000ffff RSI: ffffc90004a0d000 RDI: ffff8801d1a15660 > RBP: ffff8801ce8ef680 R08: ffffed003a342acd R09: ffff8801d1a15660 > R10: 0000000000000001 R11: ffffed003a342acc R12: ffffffffffffffff > R13: 0000000000000000 R14: ffff8801d1a15660 R15: 0000000000000000 > __bitmap_set+0xdd/0x110 lib/bitmap.c:274 > bitmap_set include/linux/bitmap.h:365 [inline] > __bitmap_parselist+0x310/0x4b0 lib/bitmap.c:616 > 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:00007fd0e0f38c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00007fd0e0f396d4 RCX: 0000000000454879 > RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000015 > RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff > R13: 000000000000067c R14: 00000000006fac40 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@xxxxxxxxxxxxxxxx. > > 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. -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
