WARNING in generic_make_request (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=149c8b68500000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=1884de4a2c8c1add0e38
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1884de...@syzkaller.appspotmail.com

fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0x2f lib/fault-inject.c:149
__should_failslab+0x153/0x1b6 mm/failslab.c:32
should_failslab+0x5/0xf mm/slab_common.c:1588
slab_pre_alloc_hook mm/slab.h:424 [inline]
slab_alloc mm/slab.c:3383 [inline]
kmem_cache_alloc+0x2b1/0x4a0 mm/slab.c:3557
getname_flags+0xce/0x590 fs/namei.c:140
WARNING: CPU: 1 PID: 7894 at block/blk-core.c:2182 bio_check_ro block/blk-core.c:2182 [inline]
WARNING: CPU: 1 PID: 7894 at block/blk-core.c:2182 blk_partition_remap block/blk-core.c:2233 [inline]
WARNING: CPU: 1 PID: 7894 at block/blk-core.c:2182 generic_make_request_checks+0x20c7/0x2420 block/blk-core.c:2284
do_sys_open+0x26c/0x520 fs/open.c:1079
Kernel panic - not syncing: panic_on_warn set ...

do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x417921
Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 6a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f506667fa20 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000417921
RDX: 00007f506667fae0 RSI: 0000000000000002 RDI: 00007f506667fae0
RBP: 0000000000000000 R08: 00007f506667fad8 R09: 0000000000000000
R10: 00007f506667fadc R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000006 R14: 0000000000000006 R15: 00000000200009d0
CPU: 1 PID: 7894 Comm: kworker/u4:6 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
panic+0x2ac/0x565 kernel/panic.c:186
__warn.cold+0x20/0x5a kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x1e1/0x330 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:bio_check_ro block/blk-core.c:2182 [inline]
RIP: 0010:blk_partition_remap block/blk-core.c:2233 [inline]
RIP: 0010:generic_make_request_checks+0x20c7/0x2420 block/blk-core.c:2284
Code: fe 01 00 00 45 8b be 9c 04 00 00 48 8d 74 24 70 48 89 ef e8 5b 82 06 00 48 c7 c7 00 1e 50 88 48 89 c6 44 89 fa e8 bf a1 b7 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 10 48 c1 ea 03 0f
RSP: 0018:ffff88804995f200 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8880a2d80080 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815b623f RDI: ffffed100932be32
RBP: ffff88809d8b35c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88809d8b35c8 R14: ffff88809da48540 R15: 0000000000000001
generic_make_request+0x279/0xe40 block/blk-core.c:2411
submit_bio+0xb1/0x480 block/blk-core.c:2575
ext4_io_submit+0x181/0x210 fs/ext4/page-io.c:356
ext4_writepages+0x1170/0x3a90 fs/ext4/inode.c:2829
do_writepages+0xe5/0x290 mm/page-writeback.c:2344
__writeback_single_inode+0x113/0x13e0 fs/fs-writeback.c:1382
writeback_sb_inodes+0x537/0xf10 fs/fs-writeback.c:1646
wb_writeback+0x28d/0xd20 fs/fs-writeback.c:1819
wb_do_writeback fs/fs-writeback.c:1964 [inline]
wb_workfn+0x2f5/0x1230 fs/fs-writeback.c:2005
process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters.
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.