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Bug
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Resolution: Done-Errata
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Undefined
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rhel-8.8.0.z
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None
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kernel-4.18.0-553.el8_10
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None
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Moderate
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sst_filesystems
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ssg_filesystems_storage_and_HA
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9
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12
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2
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QE ack
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False
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None
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Red Hat Enterprise Linux
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None
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Pass
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Automated
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None
What were you trying to do that didn't work?
kernel panic when one process reads from procfiles under /proc/fs/nfsd/clients at the same time as an nfsd completes an unmount for a client.
[ 147.468851] WARNING: CPU: 5 PID: 1921 at fs/nfsd/nfsctl.c:1261 nfsdfs_remove_files+0xcd/0xf0 [nfsd]
[ 147.468942] Kernel panic - not syncing: panic_on_warn set ...[ 147.469363] CPU: 5 PID: 1921 Comm: nfsd Kdump: loaded Not tainted 4.18.0-477.15.1.el8_8.x86_64 #1
[ 147.469581] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc37 04/01/2014
[ 147.469738] Call Trace:
[ 147.469862] dump_stack+0x41/0x60
[ 147.470043] panic+0xe7/0x2ac
[ 147.470250] ? nfsdfs_remove_files+0xcd/0xf0 [nfsd]
[ 147.470525] __warn.cold.14+0x31/0x38
[ 147.470702] ? nfsdfs_remove_files+0xcd/0xf0 [nfsd]
[ 147.470985] ? nfsdfs_remove_files+0xcd/0xf0 [nfsd]
[ 147.471333] report_bug+0xb1/0xe0
[ 147.471508] ? internal_add_timer+0x42/0x70
[ 147.471713] do_error_trap+0x9e/0xd0
[ 147.471907] do_invalid_op+0x36/0x40
[ 147.472092] ? nfsdfs_remove_files+0xcd/0xf0 [nfsd]
[ 147.472432] invalid_op+0x14/0x20
[ 147.472632] RIP: 0010:nfsdfs_remove_files+0xcd/0xf0 [nfsd]
[ 147.472967] Code: 48 8b 95 90 00 00 00 48 8d 85 90 00 00 00 48 89 eb 48 8d aa 70 ff ff ff 4c 39 e0 74 11 48 8b 43 30 48 85 c0 0f 85 70 ff ff ff <0f> 0b eb d2 5b 5d 41 5c 41 5d 41 5e e9 42 24 dd d6 0f 0b eb c1 66
[ 147.473525] RSP: 0018:ffffba28c192fcd0 EFLAGS: 00010246
[ 147.473729] RAX: 0000000000000000 RBX: ffff8f9bd0007c00 RCX: ffff8f9b406be380
[ 147.473982] RDX: ffff8f9b5383b160 RSI: ffff8f9b406be380 RDI: ffff8f9b5387e058
[ 147.474258] RBP: ffff8f9b5383b0d0 R08: ffff8f9b02414c88 R09: ffffffff98687708
[ 147.474497] R10: ffff8f9b40262758 R11: 0000000000000000 R12: ffff8f9b5383b160
[ 147.474728] R13: ffff8f9b5383b0c0 R14: 0000000000000000 R15: ffff8f9b53fbe5a0
[ 147.475019] nfsd_client_rmdir+0x31/0xc0 [nfsd]
[ 147.475350] free_client+0x9d/0x100 [nfsd]
[ 147.475630] __destroy_client+0x1df/0x230 [nfsd]
[ 147.475829] nfsd4_setclientid_confirm+0x1f4/0x410 [nfsd]
[ 147.476083] nfsd4_proc_compound+0x30e/0x670 [nfsd]
[ 147.476420] nfsd_dispatch+0x15e/0x290 [nfsd]
[ 147.476647] svc_process_common+0x360/0x5c0 [sunrpc]
[ 147.477223] ? svc_sock_secure_port+0x12/0x40 [sunrpc]
[ 147.477498] ? nfsd_svc+0x2f0/0x2f0 [nfsd]
[ 147.477697] ? nfsd_shutdown_threads+0x80/0x80 [nfsd]
[ 147.478003] svc_process+0xb7/0xf0 [sunrpc]
[ 147.478261] nfsd+0xe3/0x140 [nfsd]
[ 147.478456] kthread+0x134/0x150
[ 147.478637] ? set_kthread_struct+0x50/0x50
[ 147.478831] ret_from_fork+0x35/0x40
Please provide the package NVR for which bug is seen:
kernel-4.18.0-477.15.1.el8_8.x86_64
How reproducible:
easy
Steps to reproduce
on nfs server:
while [[ 42 ]] ; do find /proc/fs/nfsd/clients/ -name info -exec cat {} \; >/dev/null ; echo -n . ; done
on nfs client:
while [[ 42 ]] ; do umount /mnt/tmp ; mount server:/exports /mnt/tmp -overs=4.0,sec=sys ; echo -n . ; done
Expected results
No WARNING/crash
Actual results
kernel WARNING
Also, observed the following panic involving rpc.mountd reading from /proc/fs/nfsd/clients/67601/info
PID: 93776 TASK: ffff9b3712074000 CPU: 14 COMMAND: "rpc.mountd"
[exception RIP: __slab_free+0x19e]
#7 [ffffb6a2a2597de8] kfree at ffffffffb0f2623e
#8 [ffffb6a2a2597e28] __free_client at ffffffffc0893f99 [nfsd]
#9 [ffffb6a2a2597e40] client_info_show at ffffffffc0894175 [nfsd]
#10 [ffffb6a2a2597e68] seq_read at ffffffffb0f8f453
#11 [ffffb6a2a2597ec8] vfs_read at ffffffffb0f64921
#12 [ffffb6a2a2597f00] ksys_read at ffffffffb0f64d8f
#13 [ffffb6a2a2597f38] do_syscall_64 at ffffffffb0c052fb
which appears to be the same issue, only reversed
- links to
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RHSA-2023:120590
kernel bug fix and enhancement update
- mentioned on
