INFO: rcu detected stall in generic_file_write_iter
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syzbot
Oct 9, 2018, 1:24:02 PM10/9/18
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 570b7bdeaf18 Add linux-next specific files for 20181009
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13243a6e400000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b5a60e1381390c4
dashboard link: https://syzkaller.appspot.com/bug?extid=4c06dfb0610e05a73876
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [ak...@linux-foundation.org arya...@virtuozzo.com
gu...@fb.com han...@cmpxchg.org jba...@fb.com ktk...@virtuozzo.com
linux-...@vger.kernel.org linu...@kvack.org mho...@suse.com
shak...@google.com wi...@infradead.org]
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4c06df...@syzkaller.appspotmail.com
Memory cgroup stats for /syz2: cache:3864KB rss:176436KB rss_huge:167936KB
shmem:0KB mapped_file:0KB dirty:3960KB writeback:0KB swap:0KB
inactive_anon:0KB active_anon:176360KB inactive_file:1932KB
active_file:1924KB unevictable:0KB
Memory cgroup out of memory: Kill process 17375 (syz-executor2) score 185
or sacrifice child
Killed process 17375 (syz-executor2) total-vm:70604kB, anon-rss:4268kB,
file-rss:33544kB, shmem-rss:0kB
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10404 ticks this GP) idle=9e2/1/0x4000000000000002
softirq=48111/48120 fqs=21
rcu: (t=10501 jiffies g=59141 q=398)
rcu: rcu_preempt kthread starved for 10460 jiffies! g59141 f0x0
RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 22608 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
schedule+0xfe/0x460 kernel/sched/core.c:3524
schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
rcu_gp_fqs_loop+0x762/0xa80 kernel/rcu/tree.c:1934
rcu_gp_kthread+0x341/0xc70 kernel/rcu/tree.c:2090
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 30019 Comm: syz-executor2 Not tainted 4.19.0-rc7-next-20181009+
#90
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x3ab lib/dump_stack.c:113
nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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:162 [inline]
rcu_dump_cpu_stacks+0x16f/0x1bc kernel/rcu/tree.c:1195
print_cpu_stall.cold.67+0x1f3/0x3c7 kernel/rcu/tree.c:1334
check_cpu_stall kernel/rcu/tree.c:1408 [inline]
rcu_pending kernel/rcu/tree.c:2961 [inline]
rcu_check_callbacks+0xf38/0x13f0 kernel/rcu/tree.c:2506
update_process_times+0x2d/0x70 kernel/time/timer.c:1636
tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
__run_hrtimer kernel/time/hrtimer.c:1398 [inline]
__hrtimer_run_queues+0x412/0x10c0 kernel/time/hrtimer.c:1460
hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline]
smp_apic_timer_interrupt+0x1a1/0x750 arch/x86/kernel/apic/apic.c:1059
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
</IRQ>
RIP: 0010:write_comp_data+0x1/0x70 kernel/kcov.c:116
Code: a5 86 44 00 e9 a6 fc ff ff 4c 89 f7 e8 f8 85 44 00 e9 6f fc ff ff e8
9e 92 c9 ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <65> 4c 8b 04 25
40 ee 01 00 65 8b 05 1f 84 83 7e a9 00 01 1f 00 48
RSP: 0018:ffff8801be9e3978 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dead000000000100 RBX: dffffc0000000000 RCX: ffffffff81a82eaa
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: ffff8801be9e3988 R08: ffff8801cc986000 R09: fffff94000d172c6
R10: fffff94000d172c6 R11: ffffea00068b9633 R12: ffff8801be9e5d10
R13: 1ffff10037d3ca7a R14: ffffea00068b9608 R15: ffff8801be9e3b10
compound_head include/linux/page-flags.h:145 [inline]
TestClearPageReferenced include/linux/page-flags.h:285 [inline]
page_check_references mm/vmscan.c:1017 [inline]
shrink_page_list+0x4bca/0xccd0 mm/vmscan.c:1255
shrink_inactive_list+0x9af/0x1c50 mm/vmscan.c:1954
shrink_list mm/vmscan.c:2266 [inline]
shrink_node_memcg+0x78b/0x18e0 mm/vmscan.c:2531
shrink_node+0x3bc/0x16b0 mm/vmscan.c:2746
shrink_zones mm/vmscan.c:2978 [inline]
do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3040
try_to_free_mem_cgroup_pages+0x4b6/0xc90 mm/vmscan.c:3341
try_charge+0x521/0x1710 mm/memcontrol.c:2209
mem_cgroup_try_charge+0x627/0xe20 mm/memcontrol.c:5892
__add_to_page_cache_locked+0x793/0x1840 mm/filemap.c:812
add_to_page_cache_lru+0x355/0xdb0 mm/filemap.c:886
pagecache_get_page+0x53a/0xf00 mm/filemap.c:1565
grab_cache_page_write_begin+0x6f/0xa0 mm/filemap.c:2998
block_write_begin+0xae/0x370 fs/buffer.c:2102
cont_write_begin+0x5ba/0x920 fs/buffer.c:2459
fat_write_begin+0x8d/0x120 fs/fat/inode.c:229
generic_perform_write+0x3aa/0x6a0 mm/filemap.c:3048
__generic_file_write_iter+0x26e/0x630 mm/filemap.c:3173
generic_file_write_iter+0x436/0x870 mm/filemap.c:3201
call_write_iter include/linux/fs.h:1844 [inline]
new_sync_write fs/read_write.c:474 [inline]
__vfs_write+0x6b8/0x9f0 fs/read_write.c:487
vfs_write+0x1fc/0x560 fs/read_write.c:549
ksys_write+0x101/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa3a75e2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 00000000fffffd97 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa3a75e36d4
R13: 00000000004c553b R14: 00000000004d8e50 R15: 00000000ffffffff
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
syzbot found the following crash on:
HEAD commit: 570b7bdeaf18 Add linux-next specific files for 20181009
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13243a6e400000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b5a60e1381390c4
dashboard link: https://syzkaller.appspot.com/bug?extid=4c06dfb0610e05a73876
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [ak...@linux-foundation.org arya...@virtuozzo.com
gu...@fb.com han...@cmpxchg.org jba...@fb.com ktk...@virtuozzo.com
linux-...@vger.kernel.org linu...@kvack.org mho...@suse.com
shak...@google.com wi...@infradead.org]
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4c06df...@syzkaller.appspotmail.com
Memory cgroup stats for /syz2: cache:3864KB rss:176436KB rss_huge:167936KB
shmem:0KB mapped_file:0KB dirty:3960KB writeback:0KB swap:0KB
inactive_anon:0KB active_anon:176360KB inactive_file:1932KB
active_file:1924KB unevictable:0KB
Memory cgroup out of memory: Kill process 17375 (syz-executor2) score 185
or sacrifice child
Killed process 17375 (syz-executor2) total-vm:70604kB, anon-rss:4268kB,
file-rss:33544kB, shmem-rss:0kB
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10404 ticks this GP) idle=9e2/1/0x4000000000000002
softirq=48111/48120 fqs=21
rcu: (t=10501 jiffies g=59141 q=398)
rcu: rcu_preempt kthread starved for 10460 jiffies! g59141 f0x0
RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 22608 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2831 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3480
schedule+0xfe/0x460 kernel/sched/core.c:3524
schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
rcu_gp_fqs_loop+0x762/0xa80 kernel/rcu/tree.c:1934
rcu_gp_kthread+0x341/0xc70 kernel/rcu/tree.c:2090
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 30019 Comm: syz-executor2 Not tainted 4.19.0-rc7-next-20181009+
#90
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x3ab lib/dump_stack.c:113
nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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:162 [inline]
rcu_dump_cpu_stacks+0x16f/0x1bc kernel/rcu/tree.c:1195
print_cpu_stall.cold.67+0x1f3/0x3c7 kernel/rcu/tree.c:1334
check_cpu_stall kernel/rcu/tree.c:1408 [inline]
rcu_pending kernel/rcu/tree.c:2961 [inline]
rcu_check_callbacks+0xf38/0x13f0 kernel/rcu/tree.c:2506
update_process_times+0x2d/0x70 kernel/time/timer.c:1636
tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
__run_hrtimer kernel/time/hrtimer.c:1398 [inline]
__hrtimer_run_queues+0x412/0x10c0 kernel/time/hrtimer.c:1460
hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline]
smp_apic_timer_interrupt+0x1a1/0x750 arch/x86/kernel/apic/apic.c:1059
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
</IRQ>
RIP: 0010:write_comp_data+0x1/0x70 kernel/kcov.c:116
Code: a5 86 44 00 e9 a6 fc ff ff 4c 89 f7 e8 f8 85 44 00 e9 6f fc ff ff e8
9e 92 c9 ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <65> 4c 8b 04 25
40 ee 01 00 65 8b 05 1f 84 83 7e a9 00 01 1f 00 48
RSP: 0018:ffff8801be9e3978 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dead000000000100 RBX: dffffc0000000000 RCX: ffffffff81a82eaa
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: ffff8801be9e3988 R08: ffff8801cc986000 R09: fffff94000d172c6
R10: fffff94000d172c6 R11: ffffea00068b9633 R12: ffff8801be9e5d10
R13: 1ffff10037d3ca7a R14: ffffea00068b9608 R15: ffff8801be9e3b10
compound_head include/linux/page-flags.h:145 [inline]
TestClearPageReferenced include/linux/page-flags.h:285 [inline]
page_check_references mm/vmscan.c:1017 [inline]
shrink_page_list+0x4bca/0xccd0 mm/vmscan.c:1255
shrink_inactive_list+0x9af/0x1c50 mm/vmscan.c:1954
shrink_list mm/vmscan.c:2266 [inline]
shrink_node_memcg+0x78b/0x18e0 mm/vmscan.c:2531
shrink_node+0x3bc/0x16b0 mm/vmscan.c:2746
shrink_zones mm/vmscan.c:2978 [inline]
do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3040
try_to_free_mem_cgroup_pages+0x4b6/0xc90 mm/vmscan.c:3341
try_charge+0x521/0x1710 mm/memcontrol.c:2209
mem_cgroup_try_charge+0x627/0xe20 mm/memcontrol.c:5892
__add_to_page_cache_locked+0x793/0x1840 mm/filemap.c:812
add_to_page_cache_lru+0x355/0xdb0 mm/filemap.c:886
pagecache_get_page+0x53a/0xf00 mm/filemap.c:1565
grab_cache_page_write_begin+0x6f/0xa0 mm/filemap.c:2998
block_write_begin+0xae/0x370 fs/buffer.c:2102
cont_write_begin+0x5ba/0x920 fs/buffer.c:2459
fat_write_begin+0x8d/0x120 fs/fat/inode.c:229
generic_perform_write+0x3aa/0x6a0 mm/filemap.c:3048
__generic_file_write_iter+0x26e/0x630 mm/filemap.c:3173
generic_file_write_iter+0x436/0x870 mm/filemap.c:3201
call_write_iter include/linux/fs.h:1844 [inline]
new_sync_write fs/read_write.c:474 [inline]
__vfs_write+0x6b8/0x9f0 fs/read_write.c:487
vfs_write+0x1fc/0x560 fs/read_write.c:549
ksys_write+0x101/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa3a75e2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 00000000fffffd97 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa3a75e36d4
R13: 00000000004c553b R14: 00000000004d8e50 R15: 00000000ffffffff
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
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