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[Bug 1964336] Re: sigchld with stress-ng V0.13.12 failed on F-5.4 s390x (kernel BUG at mm/zswap.c:896)

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Jürg Häfliger <1964336@xxxxxxxxxxxxxxxxxx>
Date: Fri, 18 Apr 2025 23:30:23 -0000
Reply-to: Bug 1964336 <1964336@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1964336

Title:
  sigchld with stress-ng V0.13.12 failed on F-5.4 s390x (kernel BUG at
  mm/zswap.c:896)

Status in ubuntu-kernel-tests:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Invalid

Bug description:
  Issue found on s390x zVM "kernel04" with Focal 5.4.0-105-generic

  With the stress-ng V0.13.12 in tip-testing branch [1], the sigchld failed with:
  10:01:55 DEBUG| [stdout] sigabrt STARTING
  10:02:26 DEBUG| [stdout] sigabrt RETURNED 0
  10:03:55 DEBUG| [stdout] sigabrt PASSED
  10:03:55 DEBUG| [stdout] sigchld STARTING
  10:31:00 INFO | Timer expired (2100 sec.), nuking pid 18392

  Error message from syslog:
  Mar  9 10:01:55 kernel04 stress-ng: info:  [155208] dispatching hogs: 4 sigabrt
  Mar  9 10:02:11 kernel04 stress-ng: info:  [155208] successful run completed in 15.98s
  Mar  9 10:03:19 kernel04 kernel: [45704.373116] ------------[ cut here ]------------
  Mar  9 10:03:19 kernel04 kernel: [45704.373119] kernel BUG at mm/zswap.c:896!
  Mar  9 10:03:19 kernel04 kernel: [45725.378594] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
  Mar  9 10:03:19 kernel04 kernel: [45739.497899] rcu: 	1-....: (1 ticks this GP) idle=426/1/0x4000000000000002 softirq=113158/113161 fqs=1050 
  Mar  9 10:03:19 kernel04 kernel: [45739.497930] 	(detected by 6, t=2102 jiffies, g=246925, q=780)
  Mar  9 10:03:19 kernel04 kernel: [45739.497932] Task dump for CPU 1:
  Mar  9 10:03:19 kernel04 kernel: [45739.497935] apport          R  running task        0 155527      2 0x00000004
  Mar  9 10:03:19 kernel04 kernel: [45739.497938] Call Trace:
  Mar  9 10:03:19 kernel04 kernel: [45739.497944] ([<0000000042a1e600>] 0x42a1e600)
  Mar  9 10:03:19 kernel04 kernel: [45739.498148] illegal operation: 0001 ilc:1 [#1] SMP 
  Mar  9 10:03:19 kernel04 kernel: [45739.498153] Modules linked in: sctp vhost_net tap vhost_vsock vmw_vsock_virtio_transport_common vhost vsock dccp_ipv4 dccp tgr192 streebog_generic sm3_generic sha3_generic rmd320 rmd256 rmd160 rmd128 nhpoly1305 poly1305_generic michael_mic md4 cmac ccm algif_rng twofish_generic twofish_common tea sm4_generic serpent_generic seed khazad fcrypt des_generic cast6_generic cast5_generic cast_common camellia_generic blowfish_generic blowfish_common anubis algif_skcipher algif_hash aegis128 algif_aead af_alg nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype br_netfilter overlay xt_conntrack ipt_REJECT nf_reject_ipv4 ip6table_mangle ip6table_nat aufs nf_tables nfnetlink ip6table_filter ip6_tables iptable_mangle xt_CHECKSUM iptable_nat xt_MASQUERADE xt_tcpudp bridge stp llc iptable_filter bpfilter openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 binfmt_misc zfs(PO) zunicode(PO) zlua(PO) zcommon(PO) znvpair(PO) zavl(PO) icp(PO) dm_multipath scsi_dh_rdac spl(O)
  Mar  9 10:03:19 kernel04 kernel: [45739.498240]  scsi_dh_emc scsi_dh_alua vmur vfio_ccw vfio_mdev mdev vfio_iommu_type1 vfio sch_fq_codel nfsd drm auth_rpcgss drm_panel_orientation_quirks nfs_acl lockd i2c_core grace sunrpc ip_tables x_tables btrfs zstd_compress zlib_deflate raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 linear pkey zcrypt crc32_vx_s390 ghash_s390 prng aes_s390 des_s390 libdes qeth_l2 dasd_eckd_mod sha512_s390 sha256_s390 qeth sha1_s390 sha_common qdio ccwgroup dasd_mod
  Mar  9 10:03:19 kernel04 kernel: [45739.498296] CPU: 1 PID: 155527 Comm: apport Tainted: P           O      5.4.0-105-generic #119-Ubuntu
  Mar  9 10:03:19 kernel04 kernel: [45739.498298] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
  Mar  9 10:03:19 kernel04 kernel: [45739.498299] Krnl PSW : 0704c00180000000 000000009facabca (zswap_writeback_entry+0x32a/0x340)
  Mar  9 10:03:19 kernel04 kernel: [45739.498308]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
  Mar  9 10:03:19 kernel04 kernel: [45739.498310] Krnl GPRS: 0000000000000000 0000000042a1e600 ffffffffffffffea 0000000000001000
  Mar  9 10:03:19 kernel04 kernel: [45739.498312]            00000000ad302000 00000000ad303000 000003e0ffffffea 00000000e6fe7278
  Mar  9 10:03:19 kernel04 kernel: [45739.498314]            000003d082b4c080 00000000e6fe7270 000000000003689a 00000000a2ba7d58
  Mar  9 10:03:19 kernel04 kernel: [45739.498315]            0000000042a1e600 000000009814ec00 000000009facaa88 000003e00f1432b8
  Mar  9 10:03:19 kernel04 kernel: [45739.498324] Krnl Code: 000000009facabbc: c0e50032bb1a	brasl	%r14,00000000a01221f0
  Mar  9 10:03:19 kernel04 kernel: [45739.498324]            000000009facabc2: a7f4ffaa		brc	15,000000009facab16
  Mar  9 10:03:19 kernel04 kernel: [45739.498324]           #000000009facabc6: a7f40001		brc	15,000000009facabc8
  Mar  9 10:03:19 kernel04 kernel: [45739.498324]           >000000009facabca: ec81ffff00d9	aghik	%r8,%r1,-1
  Mar  9 10:03:19 kernel04 kernel: [45739.498324]            000000009facabd0: a7f4fefe		brc	15,000000009faca9cc
  Mar  9 10:03:19 kernel04 kernel: [45739.498324]            000000009facabd4: 0707		bcr	0,%r7
  Mar  9 10:03:19 kernel04 kernel: [45739.498324]            000000009facabd6: 0707		bcr	0,%r7
  Mar  9 10:03:19 kernel04 kernel: [45739.498324]            000000009facabd8: 0707		bcr	0,%r7
  Mar  9 10:03:19 kernel04 kernel: [45739.498341] Call Trace:
  Mar  9 10:03:19 kernel04 kernel: [45739.498344] ([<000000009facaa88>] zswap_writeback_entry+0x1e8/0x340)
  Mar  9 10:03:19 kernel04 kernel: [45739.498348]  [<000000009fb0a23c>] zbud_reclaim_page+0x14c/0x2b0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498350]  [<000000009fb0a3e0>] zbud_zpool_shrink+0x40/0x80 
  Mar  9 10:03:19 kernel04 kernel: [45739.498352]  [<000000009facae72>] zswap_frontswap_store+0x292/0x5c0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498354]  [<000000009fac91a4>] __frontswap_store+0xb4/0x1a0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498358]  [<000000009fac05ba>] swap_writepage+0x5a/0xc0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498363]  [<000000009fa66908>] pageout.isra.0+0x118/0x3e0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498366]  [<000000009fa6a9fc>] shrink_page_list+0xa3c/0xe90 
  Mar  9 10:03:19 kernel04 kernel: [45739.498368]  [<000000009fa6ba50>] shrink_inactive_list+0x1f0/0x4e0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498372]  [<000000009fa6c644>] shrink_node_memcg+0x2f4/0x3f0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498374]  [<000000009fa6c804>] shrink_node+0xc4/0x4d0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498376]  [<000000009fa6ccee>] do_try_to_free_pages+0xde/0x400 
  Mar  9 10:03:19 kernel04 kernel: [45739.498379]  [<000000009fa6d0fe>] try_to_free_pages+0xee/0x230 
  Mar  9 10:03:19 kernel04 kernel: [45739.498382]  [<000000009fab9c8c>] __alloc_pages_slowpath+0x31c/0xe90 
  Mar  9 10:03:19 kernel04 kernel: [45739.498385]  [<000000009fabaab4>] __alloc_pages_nodemask+0x2b4/0x330 
  Mar  9 10:03:19 kernel04 kernel: [45739.498391]  [<000000009f877a62>] page_table_alloc+0x122/0x270 
  Mar  9 10:03:19 kernel04 kernel: [45739.498395]  [<000000009fa9345a>] __pte_alloc+0x2a/0xe0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498398]  [<000000009fa938ea>] do_anonymous_page+0x3da/0x5c0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498400]  [<000000009fa98052>] __handle_mm_fault+0x7a2/0x910 
  Mar  9 10:03:19 kernel04 kernel: [45739.498403]  [<000000009fa98286>] handle_mm_fault+0xc6/0x180 
  Mar  9 10:03:19 kernel04 kernel: [45739.498408]  [<000000009f871770>] do_dat_exception+0x120/0x3d0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498413]  [<00000000a0134e9e>] pgm_check_handler+0x1da/0x230 
  Mar  9 10:03:19 kernel04 kernel: [45739.498414] Last Breaking-Event-Address:
  Mar  9 10:03:19 kernel04 kernel: [45739.498416]  [<000000009facabc6>] zswap_writeback_entry+0x326/0x340
  Mar  9 10:03:19 kernel04 kernel: [45739.498420] ---[ end trace 224932a82b86d475 ]---
  Mar  9 10:03:19 kernel04 kernel: [45739.498431] ------------[ cut here ]------------
  Mar  9 10:03:19 kernel04 kernel: [45739.498436] WARNING: CPU: 1 PID: 155527 at kernel/exit.c:726 do_exit+0x40/0xb60
  Mar  9 10:03:19 kernel04 kernel: [45739.498437] Modules linked in: sctp vhost_net tap vhost_vsock vmw_vsock_virtio_transport_common vhost vsock dccp_ipv4 dccp tgr192 streebog_generic sm3_generic sha3_generic rmd320 rmd256 rmd160 rmd128 nhpoly1305 poly1305_generic michael_mic md4 cmac ccm algif_rng twofish_generic twofish_common tea sm4_generic serpent_generic seed khazad fcrypt des_generic cast6_generic cast5_generic cast_common camellia_generic blowfish_generic blowfish_common anubis algif_skcipher algif_hash aegis128 algif_aead af_alg nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype br_netfilter overlay xt_conntrack ipt_REJECT nf_reject_ipv4 ip6table_mangle ip6table_nat aufs nf_tables nfnetlink ip6table_filter ip6_tables iptable_mangle xt_CHECKSUM iptable_nat xt_MASQUERADE xt_tcpudp bridge stp llc iptable_filter bpfilter openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 binfmt_misc zfs(PO) zunicode(PO) zlua(PO) zcommon(PO) znvpair(PO) zavl(PO) icp(PO) dm_multipath scsi_dh_rdac spl(O)
  Mar  9 10:03:19 kernel04 kernel: [45739.498471]  scsi_dh_emc scsi_dh_alua vmur vfio_ccw vfio_mdev mdev vfio_iommu_type1 vfio sch_fq_codel nfsd drm auth_rpcgss drm_panel_orientation_quirks nfs_acl lockd i2c_core grace sunrpc ip_tables x_tables btrfs zstd_compress zlib_deflate raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 linear pkey zcrypt crc32_vx_s390 ghash_s390 prng aes_s390 des_s390 libdes qeth_l2 dasd_eckd_mod sha512_s390 sha256_s390 qeth sha1_s390 sha_common qdio ccwgroup dasd_mod
  Mar  9 10:03:19 kernel04 kernel: [45739.498498] CPU: 1 PID: 155527 Comm: apport Tainted: P      D    O      5.4.0-105-generic #119-Ubuntu
  Mar  9 10:03:19 kernel04 kernel: [45739.498499] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
  Mar  9 10:03:19 kernel04 kernel: [45739.498501] Krnl PSW : 0704e00180000000 000000009f8ccaa0 (do_exit+0x40/0xb60)
  Mar  9 10:03:19 kernel04 kernel: [45739.498505]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
  Mar  9 10:03:19 kernel04 kernel: [45739.498508] Krnl GPRS: 000000000000000a 000003e00f1438a8 00000000e7eb0348 0000000000000007
  Mar  9 10:03:19 kernel04 kernel: [45739.498510]            0000000000000007 00000000a06fe098 0000000000000001 000000000000000b
  Mar  9 10:03:19 kernel04 kernel: [45739.498511]            0704c00180000000 000000009f84d200 00000000a02c4bf8 0000000042a1e600
  Mar  9 10:03:19 kernel04 kernel: [45739.498514]            0000000042a1e600 0000000000000000 000003e00f143088 000003e00f143018
  Mar  9 10:03:19 kernel04 kernel: [45739.498520] Krnl Code: 000000009f8cca90: e32010000004	lg	%r2,0(%r1)
  Mar  9 10:03:19 kernel04 kernel: [45739.498520]            000000009f8cca96: ec1203598064	cgrj	%r1,%r2,8,000000009f8cd148
  Mar  9 10:03:19 kernel04 kernel: [45739.498520]           #000000009f8cca9c: a7f40001		brc	15,000000009f8cca9e
  Mar  9 10:03:19 kernel04 kernel: [45739.498520]           >000000009f8ccaa0: 588003a8		l	%r8,936
  Mar  9 10:03:19 kernel04 kernel: [45739.498520]            000000009f8ccaa4: ecd82bb70055	risbg	%r13,%r8,43,183,0
  Mar  9 10:03:19 kernel04 kernel: [45739.498520]            000000009f8ccaaa: a774055b		brc	7,000000009f8cd560
  Mar  9 10:03:19 kernel04 kernel: [45739.498520]            000000009f8ccaae: e310b6b00012	lt	%r1,1712(%r11)
  Mar  9 10:03:19 kernel04 kernel: [45739.498520]            000000009f8ccab4: a7840550		brc	8,000000009f8cd554
  Mar  9 10:03:19 kernel04 kernel: [45739.498542] Call Trace:
  Mar  9 10:03:19 kernel04 kernel: [45739.498544] ([<224932a82b86d475>] 0x224932a82b86d475)
  Mar  9 10:03:19 kernel04 kernel: [45739.498548]  [<000000009f8603ea>] die+0x14a/0x170 
  Mar  9 10:03:19 kernel04 kernel: [45739.498551]  [<000000009f84d340>] illegal_op+0x140/0x150 
  Mar  9 10:03:19 kernel04 kernel: [45739.498553]  [<00000000a0134e9e>] pgm_check_handler+0x1da/0x230 
  Mar  9 10:03:19 kernel04 kernel: [45739.498555]  [<000000009facabca>] zswap_writeback_entry+0x32a/0x340 
  Mar  9 10:03:19 kernel04 kernel: [45739.498558] ([<000000009facaa88>] zswap_writeback_entry+0x1e8/0x340)
  Mar  9 10:03:19 kernel04 kernel: [45739.498561]  [<000000009fb0a23c>] zbud_reclaim_page+0x14c/0x2b0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498566]  [<000000009fb0a3e0>] zbud_zpool_shrink+0x40/0x80 
  Mar  9 10:03:19 kernel04 kernel: [45739.498569]  [<000000009facae72>] zswap_frontswap_store+0x292/0x5c0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498571]  [<000000009fac91a4>] __frontswap_store+0xb4/0x1a0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498574]  [<000000009fac05ba>] swap_writepage+0x5a/0xc0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498576]  [<000000009fa66908>] pageout.isra.0+0x118/0x3e0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498579]  [<000000009fa6a9fc>] shrink_page_list+0xa3c/0xe90 
  Mar  9 10:03:19 kernel04 kernel: [45739.498582]  [<000000009fa6ba50>] shrink_inactive_list+0x1f0/0x4e0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498584]  [<000000009fa6c644>] shrink_node_memcg+0x2f4/0x3f0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498586]  [<000000009fa6c804>] shrink_node+0xc4/0x4d0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498589]  [<000000009fa6ccee>] do_try_to_free_pages+0xde/0x400 
  Mar  9 10:03:19 kernel04 kernel: [45739.498592]  [<000000009fa6d0fe>] try_to_free_pages+0xee/0x230 
  Mar  9 10:03:19 kernel04 kernel: [45739.498594]  [<000000009fab9c8c>] __alloc_pages_slowpath+0x31c/0xe90 
  Mar  9 10:03:19 kernel04 kernel: [45739.498596]  [<000000009fabaab4>] __alloc_pages_nodemask+0x2b4/0x330 
  Mar  9 10:03:19 kernel04 kernel: [45739.498599]  [<000000009f877a62>] page_table_alloc+0x122/0x270 
  Mar  9 10:03:19 kernel04 kernel: [45739.498601]  [<000000009fa9345a>] __pte_alloc+0x2a/0xe0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498603]  [<000000009fa938ea>] do_anonymous_page+0x3da/0x5c0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498606]  [<000000009fa98052>] __handle_mm_fault+0x7a2/0x910 
  Mar  9 10:03:19 kernel04 kernel: [45739.498608]  [<000000009fa98286>] handle_mm_fault+0xc6/0x180 
  Mar  9 10:03:19 kernel04 kernel: [45739.498611]  [<000000009f871770>] do_dat_exception+0x120/0x3d0 
  Mar  9 10:03:19 kernel04 kernel: [45739.498614]  [<00000000a0134e9e>] pgm_check_handler+0x1da/0x230 
  Mar  9 10:03:19 kernel04 kernel: [45739.498615] Last Breaking-Event-Address:
  Mar  9 10:03:19 kernel04 kernel: [45739.498618]  [<000000009f8cca9c>] do_exit+0x3c/0xb60
  Mar  9 10:03:19 kernel04 kernel: [45739.498620] ---[ end trace 224932a82b86d476 ]---

  Please find the complete log in the attachment.

  [1] https://git.launchpad.net/~canonical-kernel-team/+git/stress-
  ng?h=tip-testing

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