Unable to generate vmcore in RHEL 8.6 due to kernel panic error during `makedumpfile`.

Solution Verified - Updated -

Issue

  • Unable to generate vmcore in RHEL 8.6 due to kernel panic error during makedumpfile.
kdump: saving vmcore-dmesg.txt
Missing the log_buf symbol
kdump: saving vmcore-dmesg.txt failed
kdump: saving vmcore
Excluding unnecessary pages                       : [100.0 %] |                  [   11.390219] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[   11.398074] PGD 0 P4D 0 
[   11.400620] Oops: 0002 [#1] SMP NOPTI
[   11.404286] CPU: 0 PID: 74 Comm: kswapd0 Not tainted 4.18.0-372.16.1.el8_6.x86_64 #1
[   11.412033] Hardware name: XXX, BIOS XXX
[   11.421779] RIP: 0010:do_shrink_slab+0x82/0x320
[   11.426325] Code: 20 49 63 47 18 be 00 00 00 00 49 8b 4f 20 f6 c2 02 48 0f 44 c6 48 85 c9 74 09 83 e2 04 0f 85 6d 02 00 00 48 8b 55 38 45 31 f6 <4c> 87 34 c2 4c 89 74 24 08 8b 75 10 4c 89 e0 85 f6 0f 84 9f 01 00
[   11.445109] RSP: 0018:ffffc9000064bc30 EFLAGS: 00010246
[   11.450340] RAX: 0000000000000000 RBX: 0000000000000400 RCX: 0000000000000000
[   11.457483] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000064
[   11.464623] RBP: ffff88806500b450 R08: 28f5c28f5c28f5c3 R09: 0000000000000008
[   11.471762] R10: ffff8880660b0db0 R11: 0000000000000001 R12: 0000000000000002
[   11.478905] R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000064bcb8
[   11.486045] FS:  0000000000000000(0000) GS:ffff888074400000(0000) knlGS:0000000000000000
[   11.494142] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.499899] CR2: 0000000000000000 CR3: 000000006ac04000 CR4: 0000000000350eb0
[   11.507646] Call Trace:
[   11.510640]  shrink_slab+0xbe/0x2f0
[   11.514664]  ? __switch_to_asm+0x35/0x70
[   11.519114]  shrink_node+0x246/0x700
[   11.523211]  balance_pgdat+0x2d7/0x550
[   11.527482]  ? __switch_to_asm+0x35/0x70
[   11.531925]  kswapd+0x201/0x3c0
[   11.535582]  ? finish_wait+0x80/0x80
[   11.539669]  ? balance_pgdat+0x550/0x550
[   11.544100]  kthread+0x10a/0x120
[   11.547829]  ? set_kthread_struct+0x40/0x40
[   11.552505]  ret_from_fork+0x35/0x40
[   11.556573] Modules linked in: xxx
[   11.580926] CR2: 0000000000000000
[   11.584768] ---[ end trace f5edf2dafec61268 ]---
[   11.669620] RIP: 0010:do_shrink_slab+0x82/0x320
[   11.674669] Code: 20 49 63 47 18 be 00 00 00 00 49 8b 4f 20 f6 c2 02 48 0f 44 c6 48 85 c9 74 09 83 e2 04 0f 85 6d 02 00 00 48 8b 55 38 45 31 f6 <4c> 87 34 c2 4c 89 74 24 08 8b 75 10 4c 89 e0 85 f6 0f 84 9f 01 00
[   11.694476] RSP: 0018:ffffc9000064bc30 EFLAGS: 00010246
[   11.700234] RAX: 0000000000000000 RBX: 0000000000000400 RCX: 0000000000000000
[   11.707912] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000064
[   11.715579] RBP: ffff88806500b450 R08: 28f5c28f5c28f5c3 R09: 0000000000000008
[   11.723235] R10: ffff8880660b0db0 R11: 0000000000000001 R12: 0000000000000002
[   11.730893] R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000064bcb8
[   11.738547] FS:  0000000000000000(0000) GS:ffff888074400000(0000) knlGS:0000000000000000
[   11.747156] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.753416] CR2: 0000000000000000 CR3: 000000006ac04000 CR4: 0000000000350eb0
[   11.761074] Kernel panic - not syncing: Fatal exception

Environment

  • Red Hat Enterprise Linux (RHEL) 8.6
  • kdump

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