[LU-12952] oops in cfs_trace_copyin_string

• Type: Bug
• Resolution: Duplicate
• Priority: Minor
• Severity: 3
• Assignee: WC Triage
• Reporter: Alex Zhuravlev

Description

hitting this quite often in sanity/133*:

BUG: unable to handle kernel paging request at ffff880138b3bfff
PGD 368b067 P4D 368b067 PUD 19f7ff067 PMD 19f639067 PTE 800ffffec74c4060
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
CPU: 0 PID: 14733 Comm: badarea_io Tainted: G        W  O     --------- ---  4.18.0 #31
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
RIP: 0010:cfs_trace_copyin_string+0x30/0x80 [libcfs]
Code: 89 f3 7f 53 4c 63 e1 48 89 d6 48 89 fd 4c 89 e2 e8 45 86 37 e1 48 85 c0 75 44 4c 89 e6 48 89 ef e8 35 2c 61 e1 eb 11 48 63 d0 <0f> b6 54 15 00 f6 82 60 26 cd 81 20 74 09 89 c2 83 e8 01 85 d2 79
RSP: 0018:ffff880131127db0 EFLAGS: 00010246
RAX: 00000000ffffffff RBX: 0000000000000080 RCX: ffff880138b3c000
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: ffff880138b3c000
RBP: ffff880138b3c000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00007ffd4712f96c R14: 0000000000000000 R15: 0000000000000000
FS:  00007f6a5a97f500(0000) GS:ffff880198e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff880138b3bfff CR3: 0000000171a29000 CR4: 00000000000006b0
Call Trace:
 __proc_lnet_portal_rotor+0xcd/0x3a0 [lnet]
 lprocfs_call_handler+0x16/0x40 [libcfs]
 lnet_debugfs_write+0x28/0x40 [libcfs]
 full_proxy_write+0x4b/0x70
 __vfs_write+0x1f/0x160
 ? rcu_sync_lockdep_assert+0x9/0x50
 ? __sb_start_write+0x13f/0x1a0
 ? vfs_write+0x183/0x1b0
 vfs_write+0xba/0x1b0
 ksys_write+0x3d/0xa0
 do_syscall_64+0x4b/0x1a0
 entry_SYSCALL_64_after_hwframe+0x6a/0xdf

Issue Links

• is related to: LU-9859 libcfs simplification