[Linux-cachefs] 5.2.0-rc1-afs-next-9f4a9105 : kernel BUG at fs/fscache/operation.c:74

[Jeremy Stanley]

We caught another basically identical panic after ~5.5 hours
running, captured via a remote netconsole stream just before the VM
instance spontaneously terminated. Attached.
-- 
Jeremy Stanley
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[19810.938809] FS-Cache:
[19810.942102] FS-Cache: Assertion failed
[19810.946177] FS-Cache: 4 == 5 is false
[19810.949270] ------------[ cut here ]------------
[19810.952131] kernel BUG at fs/fscache/operation.c:74!
[19810.954445] invalid opcode: 0000 [#1] SMP PTI
[19810.955224] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.2.0-rc1-afs-next-9f4a9105 #2
[19810.956028] Hardware name: Xen HVM domU, BIOS 4.1.5 11/28/2013
[19810.956756] RIP: 0010:fscache_enqueue_operation+0x1f1/0x210 [fscache]
[19810.957473] Code: c7 78 32 91 c0 e8 22 e6 be c3 48 c7 c7 86 32 91 c0 e8 16 e6 be c3 8b 73 40 ba 05 00 00 00 48 c7 c7 a8 22 91 c0 e8 02 e6 be c3 <0f> 0b 48 c7 c7 f0 22 91 c0 e8 f4 e5 be c3 0f 0b 0f 1f 44 00 00 66
[19810.958955] RSP: 0018:ffffa54940d90c78 EFLAGS: 00010086
[19810.959725] RAX: 0000000000000019 RBX: ffff8f3892725f00 RCX: 0000000000000006
[19810.960486] RDX: 0000000000000000 RSI: 0000000000000082 RDI: ffff8f3a47497380
[19810.961245] RBP: ffffa54940d90c90 R08: 00000000000004f4 R09: ffff8f3a46c52810
[19810.962008] R10: 00000000000002d8 R11: ffff8f3859befeb8 R12: ffff8f3892725f00
[19810.962761] R13: ffff8f38bc1934a0 R14: ffffffff85a08130 R15: 0000000000000000
[19810.963647] FS:  0000000000000000(0000) GS:ffff8f3a47480000(0000) knlGS:0000000000000000
[19810.964466] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[19810.965231] CR2: 00007f1ca4990000 CR3: 000000016f7ac000 CR4: 00000000000006e0
[19810.965964] Call Trace:
[19810.966679]  <IRQ>
[19810.967415]  cachefiles_read_waiter+0xd5/0x130 [cachefiles]
[19810.968125]  __wake_up_common+0x73/0x130
[19810.968888]  __wake_up_locked_key_bookmark+0x1b/0x20
[19810.969873]  wake_up_page_bit+0xab/0x100
[19810.970615]  unlock_page+0x26/0x30
[19810.971301]  mpage_end_io+0x74/0x100
[19810.971956]  bio_endio+0xf0/0x170
[19810.972595]  dec_pending+0x10e/0x210
[19810.973231]  clone_endio+0x90/0x180
[19810.973844]  bio_endio+0xf0/0x170
[19810.974496]  blk_update_request+0x7b/0x300
[19810.975098]  blk_mq_end_request+0x20/0x130
[19810.975816]  blkif_complete_rq+0x15/0x20
[19810.976483]  blk_done_softirq+0x92/0xc0
[19810.977017]  __do_softirq+0xe4/0x2f3
[19810.977543]  irq_exit+0xb6/0xc0
[19810.978059]  xen_evtchn_do_upcall+0x30/0x50
[19810.978577]  xen_hvm_callback_vector+0xf/0x20
[19810.979110]  </IRQ>
[19810.979613] RIP: 0010:native_safe_halt+0x12/0x20
[19810.980125] Code: 00 0f 00 2d 42 30 5c 00 f4 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e9 07 00 00 00 0f 00 2d 22 30 5c 00 fb f4 <5d> c3 90 90 90 90 90 90 90 90 90 90 90 90 e8 7b 4d b7 3b 55 48 89
[19810.981225] RSP: 0018:ffffa54940ccfe70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff0c
[19810.981789] RAX: ffffffff84e46e50 RBX: 0000000000000002 RCX: 0000000000000001
[19810.982361] RDX: ffff8f3a474ab980 RSI: ffffa54940ccfe40 RDI: 0000000000000000
[19810.982942] RBP: ffffa54940ccfe70 R08: 00000000133325b8 R09: 0000000000000076
[19810.983537] R10: 00000000000003d4 R11: ffff8f3924dc73e4 R12: 0000000000000002
[19810.984122] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[19810.984715]  ? __cpuidle_text_start+0x8/0x8
[19810.985300]  default_idle+0x22/0x150
[19810.985949]  arch_cpu_idle+0x15/0x20
[19810.986531]  default_idle_call+0x23/0x30
[19810.987130]  do_idle+0x1cb/0x280
[19810.987719]  cpu_startup_entry+0x1d/0x20
[19810.988365]  start_secondary+0x181/0x1d0
[19810.988940]  secondary_startup_64+0xa4/0xb0
[19810.989485] Modules linked in: netconsole kafs fcrypt pcbc rxrpc cachefiles fscache binfmt_misc ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_filter ppdev intel_rapl sb_edac joydev intel_rapl_perf input_leds serio_raw parport_pc parport mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi xenfs xen_privcmd 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 hid_generic usbhid hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cirrus aesni_intel drm_kms_helper syscopyarea aes_x86_64 sysfillrect crypto_simd sysimgblt cryptd fb_sys_fops glue_helper drm psmouse pata_acpi i2c_piix4 floppy
[19810.994087] ---[ end trace 2068878944818e0d ]---
[19810.994681] RIP: 0010:fscache_enqueue_operation+0x1f1/0x210 [fscache]
[19810.995282] Code: c7 78 32 91 c0 e8 22 e6 be c3 48 c7 c7 86 32 91 c0 e8 16 e6 be c3 8b 73 40 ba 05 00 00 00 48 c7 c7 a8 22 91 c0 e8 02 e6 be c3 <0f> 0b 48 c7 c7 f0 22 91 c0 e8 f4 e5 be c3 0f 0b 0f 1f 44 00 00 66
[19810.996553] RSP: 0018:ffffa54940d90c78 EFLAGS: 00010086
[19810.997178] RAX: 0000000000000019 RBX: ffff8f3892725f00 RCX: 0000000000000006
[19810.997807] RDX: 0000000000000000 RSI: 0000000000000082 RDI: ffff8f3a47497380
[19810.998438] RBP: ffffa54940d90c90 R08: 00000000000004f4 R09: ffff8f3a46c52810
[19810.999126] R10: 00000000000002d8 R11: ffff8f3859befeb8 R12: ffff8f3892725f00
[19810.999770] R13: ffff8f38bc1934a0 R14: ffffffff85a08130 R15: 0000000000000000
[19811.000421] FS:  0000000000000000(0000) GS:ffff8f3a47480000(0000) knlGS:0000000000000000
[19811.001075] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[19811.001734] CR2: 00007f1ca4990000 CR3: 000000016f7ac000 CR4: 00000000000006e0
[19811.002456] Kernel panic - not syncing: Fatal exception in interrupt
[19811.003259] Kernel Offset: 0x3400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
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