I ran into the following WARNING while doing a bcachefs fstests run against
tumbleweed's 6.7.1-2-default kernel:
generic/068 [ 395.418059][ T263] run fstests generic/068 at 2024-01-30
12:03:57
[ 395.638334][T22189] bcachefs (zram0): going read-write
[ 395.707629][T22212] bcachefs (zram1): mounting version 1.3: rebalance_work
[ 395.712533][T22212] bcachefs (zram1): initializing new filesystem
[ 395.717313][T22212] bcachefs (zram1): going read-write
[ 395.722198][T22212] bcachefs (zram1): initializing freespace
[ 397.884529][T22254] bcachefs (zram1): going read-write
[ 398.093884][T22267] ------------[ cut here ]------------
[ 398.095352][T22267] WARNING: CPU: 1 PID: 22267 at
drivers/block/zram/zram_drv.c:1948 zram_submit_bio+0x1bd/0x980 [zram]
[ 398.097604][T22267] Modules linked in: ext4 mbcache jbd2 loop dm_flakey
dm_mod bcachefs lz4_compress xor lz4hc_compress libcrc32c raid6_pq zram
virtio_blk
[ 398.100412][T22267] CPU: 1 PID: 22267 Comm: fsstress Tainted: G W
6.7.1-2-default #1 openSUSE Tumbleweed
d50116cfdb1b14a701e904c894d8f1c040bf1146
[ 398.103313][T22267] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014
[ 398.105681][T22267] RIP: 0010:zram_submit_bio+0x1bd/0x980 [zram]
[ 398.106940][T22267] Code: ff ff 83 44 24 14 01 45 31 c9 45 85 f6 0f 85 e8 fe
ff ff 4c 8b 64 24 18 e9 25 07 00 00 0f b6 d0 83 fa 03 74 31 83 fa 09 74 2c <0f>
0b 48 8b 44 20
[ 398.110897][T22267] RSP: 0018:ffffb8a3822c7ca8 EFLAGS: 00010297
[ 398.112119][T22267] RAX: 0000000000000002 RBX: ffff9ba30095e800 RCX:
ffff9ba30dbfb210
[ 398.113774][T22267] RDX: 0000000000000002 RSI: 000000000002d23e RDI:
ffff9ba30dbfb210
[ 398.115360][T22267] RBP: ffff9ba31ad5c000 R08: 0000000000000001 R09:
0000000000004001
[ 398.116957][T22267] R10: 000056356b09a2f1 R11: 000000000000038f R12:
ffff9ba31ad5c000
[ 398.118548][T22267] R13: 0000000000000000 R14: 0000000000000000 R15:
ffff9ba31acce800
[ 398.120117][T22267] FS: 00007fa7c7ee6040(0000) GS:ffff9ba437d00000(0000)
knlGS:0000000000000000
[ 398.121925][T22267] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 398.123307][T22267] CR2: 00007fa7c7c00000 CR3: 000000011cdc8000 CR4:
00000000000006f0
[ 398.124906][T22267] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 398.126508][T22267] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 398.128094][T22267] Call Trace:
[ 398.128752][T22267] <TASK>
[ 398.129364][T22267] ? zram_submit_bio+0x1bd/0x980 [zram
306d1de59f59b3565665180c68ecbb123a2737f1]
[ 398.131148][T22267] ? __warn+0x81/0x130
[ 398.131997][T22267] ? zram_submit_bio+0x1bd/0x980 [zram
306d1de59f59b3565665180c68ecbb123a2737f1]
[ 398.133849][T22267] ? report_bug+0x171/0x1a0
[ 398.134786][T22267] ? handle_bug+0x3c/0x80
[ 398.135650][T22267] ? exc_invalid_op+0x17/0x70
[ 398.136583][T22267] ? asm_exc_invalid_op+0x1a/0x20
[ 398.137579][T22267] ? zram_submit_bio+0x1bd/0x980 [zram
306d1de59f59b3565665180c68ecbb123a2737f1]
[ 398.138979][T22267] ? __schedule+0x3e5/0x14b0
[ 398.139577][T22267] ? bio_associate_blkg_from_css+0xf8/0x340
[ 398.140325][T22267] ? queue_work_on+0x3b/0x50
[ 398.140907][T22267] __submit_bio+0xb3/0x170
[ 398.141471][T22267] submit_bio_noacct_nocheck+0x147/0x380
[ 398.142192][T22267] bch2_inode_flush_nocow_writes_async+0xc9/0x140
[bcachefs 87a9241f310455d8dd26e5519b093c57d3f4361d]
[ 398.143652][T22267] bch2_flush_inode.part.0+0xb3/0xd0 [bcachefs
87a9241f310455d8dd26e5519b093c57d3f4361d]
[ 398.144954][T22267] bch2_fsync+0x82/0xa0 [bcachefs
87a9241f310455d8dd26e5519b093c57d3f4361d]
[ 398.146115][T22267] __x64_sys_fdatasync+0x52/0x90
[ 398.146742][T22267] do_syscall_64+0x64/0xe0