This one is fixed in 5.4.0-14. It's the pty03 LTP that is fixed by
upstream commit 0ace17d56824 (can, slip: Protect tty->disc_data in
write_wakeup and close with RCU).
** Changed in: linux (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1866910
Title:
[Ubu 20.04][5.4.0-12-generic] Observed Kernel OOPS while running LTP
Test in Regression_Bucket
Status in The Ubuntu-power-systems project:
New
Status in linux package in Ubuntu:
Fix Released
Bug description:
== Comment: #0 - Naveen Kumar T <[email protected]> - 2020-01-28 23:43:11 ==
---Problem Description---
Observed Kernel OOPS while running LTP Test in Regression_Bucket
---uname output---
root@ltc-wcwsp3:~# uname -a
Linux ltc-wcwsp3 5.4.0-12-generic #15-Ubuntu SMP Tue Jan 21 17:56:24 UTC 2020
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = Witherspoon DD2.3
Test Environment:
- Hardware: Witherspoon DD2.3
- Disro: Ubu 20.04
- Kernel: 5.4.0-12-generic
Console log:
------------
00:44:50 KernelOOPS: Kernel OOPS (machine in state '6'): Oops: Kernel access
of bad area, sig: 11 [#1]
00:44:50 [44921.236545] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA
PowerNV
00:44:50 [44921.236555] Modules linked in: slip serport nfsv3 nfs fscache
sctp quota_v2 quota_tree brd nls_iso8859_1 ntfs exfat(C) xfs overlay lp
parport_pc ppdev parport st iptable_filter bpfilter cfg80211 xsk_diag tcp_diag
udp_diag raw_diag inet_diag unix_diag af_packet_diag netlink_diag macsec
binfmt_misc nfsd auth_rpcgss nfs_acl lockd grace sunrpc dm_multipath
scsi_dh_rdac scsi_dh_emc scsi_dh_alua vmx_crypto joydev input_leds mac_hid
ofpart cmdlinepart at24 ipmi_powernv ipmi_devintf powernv_flash opal_prd
ipmi_msghandler ibmpowernv mtd uio_pdrv_genirq uio sch_fq_codel ip_tables
x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov
async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath
linear mlx5_ib ib_uverbs ib_core hid_generic usbhid hid nouveau bnx2x ast
drm_vram_helper mlx5_core i2c_algo_bit ttm crct10dif_vpmsum drm_kms_helper
syscopyarea sysfillrect sysimgblt fb_sys_fops nvme drm nvme_core mdio tg3
libcrc32c ahci libahci tls drm_panel_orientation_quirks
00:44:50 [44921.236608] crc32c_vpmsum mlxfw [last unloaded: parport_pc]
00:44:50 [44921.236841] CPU: 140 PID: 1134354 Comm: pty03 Tainted: G
C 5.4.0-12-generic #15-Ubuntu
00:44:50 [44921.236854] NIP: c000000000163964 LR: c0080000139b02d4 CTR:
c000000000163930
00:44:50 [44921.236875] REGS: c000201ab34d7800 TRAP: 0300 Tainted: G
C (5.4.0-12-generic)
00:44:50 [44921.236887] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR:
84004880 XER: 20040000
00:44:50 [44921.236900] CFAR: c0080000139b309c DAR: 0000000000000020 DSISR:
40000000 IRQMASK: 1
00:44:50 [44921.236900] GPR00: c0080000139b02d4 c000201ab34d7a90
c000000001a5ba00 0000000000000800
00:44:50 [44921.236900] GPR04: c000001ffa46f400 0000000000000020
c008000013751260 0000000000000800
00:44:50 [44921.236900] GPR08: 0000000000000001 c000000001a924f0
c000201b09452000 c0080000139b3088
00:44:50 [44921.236900] GPR12: c000000000163930 c000201fff5f7c00
00007c1913f34410 0000000000000000
00:44:50 [44921.236900] GPR16: 00007c1913fc0000 00007c1913f30320
00007c1913caf240 00007c1913f34420
00:44:50 [44921.236900] GPR20: 0000000000000000 0000000000000000
0000000000000008 0000000000000000
00:44:50 [44921.236900] GPR24: 00000ce690ad0288 00000ce690ad02a8
c000201c09f97570 0000000000000000
00:44:50 [44921.236900] GPR28: c000201b1336da00 ffffffffffffffe7
0000000000000000 c000201b09452000
00:44:50 [44921.237006] NIP [c000000000163964] queue_work_on+0x34/0xb0
00:44:50 [44921.237027] LR [c0080000139b02d4] slip_write_wakeup+0x3c/0x60
[slip]
00:44:50 [44921.237046] Call Trace:
00:44:50 [44921.237063] [c000201ab34d7a90] [c000201ab34d7ae0]
0xc000201ab34d7ae0 (unreliable)
00:44:50 [44921.237096] [c000201ab34d7ac0] [c0080000139b02d4]
slip_write_wakeup+0x3c/0x60 [slip]
00:44:50 [44921.237130] [c000201ab34d7ae0] [c0000000008e53c0]
tty_wakeup+0x90/0xe0
00:44:50 [44921.237173] [c000201ab34d7b10] [c0000000008f84ac]
pty_unthrottle+0x2c/0x60
00:44:50 [44921.237215] [c000201ab34d7b40] [c0000000008f0500]
tty_unthrottle+0x80/0xb0
00:44:50 [44921.237256] [c000201ab34d7b70] [c0000000008f0bc0]
__tty_perform_flush+0x130/0x150
00:44:50 [44921.237298] [c000201ab34d7ba0] [c0000000008ec6cc]
n_tty_ioctl+0x20c/0x2b0
00:44:50 [44921.237339] [c000201ab34d7bf0] [c0000000008e8748]
tty_ioctl+0x3f8/0xe80
00:44:50 [44921.237360] [c000201ab34d7d00] [c000000000494f8c]
do_vfs_ioctl+0x96c/0xbe0
00:44:50 [44921.237381] [c000201ab34d7db0] [c0000000004952c4]
ksys_ioctl+0xc4/0x110
00:44:50 [44921.237411] [c000201ab34d7e00] [c000000000495338]
sys_ioctl+0x28/0x80
00:44:50 [44921.237432] [c000201ab34d7e20] [c00000000000b278]
system_call+0x5c/0x68
00:44:50 [44921.237462] Instruction dump:
00:44:50 [44921.237479] 384280d0 7c0802a6 60000000 7c0802a6 fbc1fff0 fbe1fff8
f8010010 f821ffd1
00:44:50 [44921.237502] 39000001 8bcd0988 990d0988 7c0004ac <7d4028a8>
7d474378 7ce029ad 40c2fff4
00:44:50 [44921.237516] ---[ end trace cf6ea8c03bff2d44 ]---
00:44:50 [44921.370320]
00:44:50 [44922.370413] Kernel panic - not syncing: Fatal exception
00:44:50 [44924.2[45060.426334658,5] OPAL: Reboot request...
00:44:50 [45060.426565497,5] RESET: Fast reboot disabled: NVLink device
enabled
00:44:50 65388] Rebooting in 10 seconds
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