Re: [syzbot] [block?] WARNING in blkdev_put (2)

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Hi,

we are seeing a similar problem on s390x architecture when partitioning
a NVMe disk on linux-next.


  [   70.403015]  nvme0n1: p1
  [   70.403197] ------------[ cut here ]------------
  [   70.403199] WARNING: CPU: 8 PID: 2452 at block/bdev.c:845 blkdev_put+0x280/0x298
  [   70.403207] Modules linked in: nft_fib_inet(E) nft_fib_ipv4(E) nft_fib_ipv6(E) nft_fib(E) nft_reject_inet(E) nf_reject_ipv4(E) nf_reject_ipv6(E) nft_reject(E) nft_ct(E) nft_chain_nat(E) nf_nat(E) nf_conntrack(E) nf_defrag_ipv6(E) nf_defrag_ipv4(E) ip_set(E) nf_tables(E) nfnetlink(E) sunrpc(E) binfmt_misc(E) uvdevice(E) s390_trng(E) eadm_sch(E) vfio_ccw(E) mdev(E) vfio_iommu_type1(E) vfio(E) sch_fq_codel(E) ip6_tables(E) ip_tables(E) x_tables(E) configfs(E) dm_service_time(E) ghash_s390(E) prng(E) chacha_s390(E) libchacha(E) aes_s390(E) des_s390(E) libdes(E) sha3_512_s390(E) sha3_256_s390(E) sha512_s390(E) sha256_s390(E) nvme(E) sha1_s390(E) sha_common(E) nvme_core(E) zfcp(E) scsi_transport_fc(E) dm_mirror(E) dm_region_hash(E) dm_log(E) scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) pkey(E) zcrypt(E) rng_core(E) dm_multipath(E) autofs4(E)
  [   70.403247] CPU: 8 PID: 2452 Comm: fdisk Tainted: G            E      6.3.0-20230228.rc0.git67.058f4df42121.300.fc37.s390x+next #1
  [   70.403249] Hardware name: IBM 3931 A01 701 (LPAR)
  [   70.403251] Krnl PSW : 0704d00180000000 00000000800cc56c (blkdev_put+0x284/0x298)
  [   70.403254]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 RI:0 EA:3
  [   70.403257] Krnl GPRS: 00000000858a9720 00000000ffffffff 0000000000000009 000000008102d600
  [   70.403259]            0000000080a6c454 0000000000000000 0000000000000000 0000000082023c00
  [   70.403260]            000000009f3a49f8 000000009f3a4800 00000000484e109f 0000000082023c00
  [   70.403262]            00000000b0932100 000003ffa56c3b18 00000000800cc32a 00000380036b3cd8
  [   70.403268] Krnl Code: 00000000800cc55e: c0e5fffffbd9      brasl   %r14,00000000800cbd10
                            00000000800cc564: a7f4ffaa          brc     15,00000000800cc4b8
                           #00000000800cc568: af000000          mc      0,0
                           >00000000800cc56c: a7f4ff68          brc     15,00000000800cc43c
                            00000000800cc570: b9040023          lgr     %r2,%r3
                            00000000800cc574: c0e5002a2d96      brasl   %r14,00000000806120a0
                            00000000800cc57a: a7f4ff58          brc     15,00000000800cc42a
                            00000000800cc57e: 0707              bcr     0,%r7
  [   70.403319] Call Trace:
  [   70.403321]  [<00000000800cc56c>] blkdev_put+0x284/0x298
  [   70.403325]  [<00000000800cd4da>] blkdev_close+0x32/0x48
  [   70.403328]  [<000000007fcee9ce>] __fput+0x96/0x290
  [   70.403332]  [<000000007fa1dfe0>] task_work_run+0x88/0xe0
  [   70.403337]  [<000000007fa9e5a0>] exit_to_user_mode_prepare+0x1a0/0x1a8
  [   70.403340]  [<0000000080625996>] __do_syscall+0x11e/0x200
  [   70.403345]  [<0000000080635162>] system_call+0x82/0xb0
  [   70.403349] Last Breaking-Event-Address:
  [   70.403350]  [<00000000800cc436>] blkdev_put+0x14e/0x298
  [   70.403353] Kernel panic - not syncing: kernel: panic_on_warn set ...
  [   70.403354] CPU: 8 PID: 2452 Comm: fdisk Tainted: G            E      6.3.0-20230228.rc0.git67.058f4df42121.300.fc37.s390x+next #1
  [   70.403357] Hardware name: IBM 3931 A01 701 (LPAR)
  [   70.403357] Call Trace:
  [   70.403358]  [<000000008062559a>] dump_stack_lvl+0x62/0x80
  [   70.403360]  [<0000000080613eb0>] panic+0x118/0x300
  [   70.403364]  [<000000007f9f3a40>] check_panic_on_warn+0x70/0x88
  [   70.403367]  [<000000007f9f3ce8>] __warn+0x108/0x150
  [   70.403369]  [<00000000805e8d76>] report_bug+0x18e/0x1e8
  [   70.403371]  [<000000007f9a11a4>] monitor_event_exception+0x44/0x80
  [   70.403374]  [<0000000080625798>] __do_pgm_check+0xf0/0x1b0
  [   70.403375]  [<00000000806352ec>] pgm_check_handler+0x11c/0x170
  [   70.403377]  [<00000000800cc56c>] blkdev_put+0x284/0x298
  [   70.403380]  [<00000000800cd4da>] blkdev_close+0x32/0x48
  [   70.403382]  [<000000007fcee9ce>] __fput+0x96/0x290
  [   70.403384]  [<000000007fa1dfe0>] task_work_run+0x88/0xe0
  [   70.403386]  [<000000007fa9e5a0>] exit_to_user_mode_prepare+0x1a0/0x1a8
  [   70.403388]  [<0000000080625996>] __do_syscall+0x11e/0x200
  [   70.403390]  [<0000000080635162>] system_call+0x82/0xb0

The problem appeared about a week ago.

Regards
Alex



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