Fresh log:
KERNEL: /usr/lib/debug/boot/vmlinux-4.15.0-55-generic
DUMPFILE: /var/crash_/201908201708/dump.201908201708 [PARTIAL DUMP]
CPUS: 32
DATE: Tue Aug 20 17:08:36 2019
UPTIME: 03:32:12
LOAD AVERAGE: 5.43, 6.39, 7.70
TASKS: 653
NODENAME: storage-gce-be-1.project.domain.net
RELEASE: 4.15.0-55-generic
VERSION: #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019
MACHINE: x86_64 (2300 Mhz)
MEMORY: 120 GB
PANIC: "BUG: unable to handle kernel paging request at ffff976688e89010"
PID: 112
COMMAND: "ksoftirqd/17"
TASK: ffff97843fccad80 [THREAD_INFO: ffff97843fccad80]
CPU: 17
STATE: TASK_RUNNING (PANIC)
[50031.661288] WARNING: CPU: 17 PID: 10720 at
/build/linux-aAn8fZ/linux-4.15.0/lib/radix-tree.c:783 delete_node+0x87/0x1f0
[50031.661291] Modules linked in: binfmt_misc tcp_diag inet_diag
ip6table_filter ip6_tables iptable_filter sch_fq_codel ib_iser rdma_cm iw_cm
ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
nls_iso8859_1 sb_edac intel_rapl_perf input_leds serio_raw mac_hid pvpanic nfsd
netconsole auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4
btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64
crypto_simd glue_helper cryptd psmouse virtio_net virtio_scsi i2c_piix4
[50031.661341] CPU: 17 PID: 10720 Comm: kworker/u64:4 Not tainted
4.15.0-55-generic #60-Ubuntu
[50031.661342] Hardware name: Google Google Compute Engine/Google Compute
Engine, BIOS Google 01/01/2011
[50031.661359] Workqueue: nfsd4_callbacks nfsd4_run_cb_work [nfsd]
[50031.661362] RIP: 0010:delete_node+0x87/0x1f0
[50031.661363] RSP: 0018:ffffae6808dcfd78 EFLAGS: 00010297
[50031.661364] RAX: ffff9766958a6498 RBX: ffff976689cb36c0 RCX: 00000000ffffffff
[50031.661365] RDX: 0000000000000000 RSI: ffff976688e88ff8 RDI: ffff976688e89010
[50031.661366] RBP: ffffae6808dcfda0 R08: 0000000000000000 R09: 0000000000000001
[50031.661367] R10: ffff976688e89020 R11: 0000000000000002 R12: ffff9783f3c37840
[50031.661368] R13: 0000000000000000 R14: ffffffffb7b83630 R15: 0000000000000000
[50031.661370] FS: 0000000000000000(0000) GS:ffff978447240000(0000)
knlGS:0000000000000000
[50031.661371] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[50031.661371] CR2: 00007fda62d297f0 CR3: 0000001ba7a0a001 CR4: 00000000001606e0
[50031.661377] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[50031.661378] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[50031.661378] Call Trace:
[50031.661384] __radix_tree_delete+0x7f/0xa0
[50031.661387] radix_tree_delete_item+0x6a/0xc0
[50031.661393] nfs4_put_stid+0x3d/0x90 [nfsd]
[50031.661398] nfsd4_cb_recall_release+0x15/0x20 [nfsd]
[50031.661403] nfsd4_run_cb_work+0xd4/0xf0 [nfsd]
[50031.661408] process_one_work+0x1de/0x410
[50031.661410] worker_thread+0x32/0x410
[50031.661413] kthread+0x121/0x140
[50031.661414] ? process_one_work+0x410/0x410
[50031.661416] ? kthread_create_worker_on_cpu+0x70/0x70
[50031.661421] ret_from_fork+0x35/0x40
[50031.661422] Code: c2 41 8b 04 24 a9 00 00 00 02 75 09 25 ff ff ff 03 41 89
04 24 49 c7 44 24 08 00 00 00 00 48 8b 46 18 48 39 f8 0f 84 2d 01 00 00 <0f> 0b
4c 89 f6 e8 2f f3 77 ff 48 85 db 75 ab 41 bf 01 00 00 00
[50031.661446] ---[ end trace 157b93e1b360abc7 ]---
[50031.715701] kernel tried to execute NX-protected page - exploit attempt?
(uid: 0)
[50031.723796] BUG: unable to handle kernel paging request at ffff976688e89010
[50031.732281] IP: 0xffff976688e89010
[50031.737185] PGD 1ba813f067 P4D 1ba813f067 PUD 1ba8140067 PMD
8000000008e000e3
[50031.744546] Oops: 0011 [#1] SMP PTI
[50031.748178] Modules linked in: binfmt_misc tcp_diag inet_diag
ip6table_filter ip6_tables iptable_filter sch_fq_codel ib_iser rdma_cm iw_cm
ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
nls_iso8859_1 sb_edac intel_rapl_perf input_leds serio_raw mac_hid pvpanic nfsd
netconsole auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4
btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64
crypto_simd glue_helper cryptd psmouse virtio_net virtio_scsi i2c_piix4
[50031.807432] CPU: 17 PID: 112 Comm: ksoftirqd/17 Tainted: G W
4.15.0-55-generic #60-Ubuntu
[50031.818702] Hardware name: Google Google Compute Engine/Google Compute
Engine, BIOS Google 01/01/2011
[50031.828051] RIP: 0010:0xffff976688e89010
[50031.833470] RSP: 0018:ffffae68066b7df0 EFLAGS: 00010296
[50031.838829] RAX: ffff976688e89010 RBX: ffff978447263640 RCX: 00000001001c001a
[50031.847498] RDX: ffff976688e89010 RSI: ffffdb4bfff6fc00 RDI: ffff976688e89010
[50031.854761] RBP: ffffae68066b7e58 R08: ffff97767dbf1320 R09: 00000001001c001a
[50031.862078] R10: ffffae68066b7dc0 R11: 00000000ffffff00 R12: ffffffffb86a9280
[50031.870718] R13: ffff978447263678 R14: ffffae68066b7e08 R15: 000000000000000a
[50031.877970] FS: 0000000000000000(0000) GS:ffff978447240000(0000)
knlGS:0000000000000000
[50031.887574] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[50031.893453] CR2: ffff976688e89010 CR3: 0000001ba7a0a006 CR4: 00000000001606e0
[50031.902104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[50031.909424] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[50031.918063] Call Trace:
[50031.920726] ? rcu_process_callbacks+0x1a7/0x4c0
[50031.926850] __do_softirq+0xe4/0x2bb
[50031.930558] run_ksoftirqd+0x22/0x60
[50031.935707] smpboot_thread_fn+0xfc/0x170
[50031.939852] kthread+0x121/0x140
[50031.944625] ? sort_range+0x30/0x30
[50031.949617] ? kthread_create_worker_on_cpu+0x70/0x70
[50031.954805] ret_from_fork+0x35/0x40
[50031.958510] Code: 00 00 00 00 00 00 00 00 00 00 00 01 3b b2 b3 40 ce 53 93
00 07 00 00 00 00 00 00 c0 36 cb 89 66 97 ff ff 40 78 c3 f3 83 97 ff ff <10> 90
e8 88 66 97 ff ff 10 90 e8 88 66 97 ff ff 00 00 00 00 00
[50031.978875] RIP: 0xffff976688e89010 RSP: ffffae68066b7df0
[50031.984399] CR2: ffff976688e89010
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https://bugs.launchpad.net/bugs/1840650
Title:
System crashes under nfs heavy load
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