syzbot

 alloc_skb include/linux/skbuff.h:995 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1189 [inline]
 netlink_sendmsg+0x97b/0xd70 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
WARNING: CPU: 0 PID: 24783 at block/blk-core.c:2180 bio_check_ro block/blk-core.c:2180 [inline]
WARNING: CPU: 0 PID: 24783 at block/blk-core.c:2180 generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2285
Kernel panic - not syncing: panic_on_warn set ...

 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153
 __do_sys_sendmsg net/socket.c:2162 [inline]
 __se_sys_sendmsg net/socket.c:2160 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c6c9
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbbe125dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbbe125e6d4 RCX: 000000000045c6c9
RDX: 0000000000000004 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 00000000000009cc R14: 00000000004cc70e R15: 0000000000000001
CPU: 0 PID: 24783 Comm: syz-executor.1 Not tainted 4.19.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x53 kernel/panic.c:541
 report_bug+0x263/0x2b0 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+0x204/0x360 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037
RIP: 0010:bio_check_ro block/blk-core.c:2180 [inline]
RIP: 0010:generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2285
Code: 85 1f 04 00 00 45 8b b6 e4 04 00 00 48 8d 73 a0 4c 89 e7 e8 4d 66 06 00 48 c7 c7 60 4f e9 87 48 89 c6 44 89 f2 e8 39 6e ea fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
RSP: 0018:ffff888025e2ef88 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888025e2f058 RCX: 0000000000000000
RDX: 000000000002c1a8 RSI: ffffffff8155a136 RDI: ffffed1004bc5de3
RBP: ffff888025e2f080 R08: ffff8880a13cc540 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888082c04700
R13: ffff888082c04708 R14: 0000000000000000 R15: 0000000000000000
 generic_make_request+0x24c/0x12d0 block/blk-core.c:2409
 submit_bio+0xba/0x470 block/blk-core.c:2573
 submit_bh_wbc+0x5dc/0x790 fs/buffer.c:3095
 __block_write_full_page+0x76e/0x1010 fs/buffer.c:1766
 block_write_full_page+0x21f/0x270 fs/buffer.c:2956
 blkdev_writepage+0x25/0x30 fs/block_dev.c:581
 __writepage+0x62/0xe0 mm/page-writeback.c:2305
 write_cache_pages+0x8ac/0x1560 mm/page-writeback.c:2240
 generic_writepages mm/page-writeback.c:2329 [inline]
 generic_writepages+0xe6/0x160 mm/page-writeback.c:2318
 blkdev_writepages+0x1e/0x30 fs/block_dev.c:1968
 do_writepages+0xf3/0x2a0 mm/page-writeback.c:2344
 __filemap_fdatawrite_range+0x28d/0x370 mm/filemap.c:446
 filemap_write_and_wait_range mm/filemap.c:679 [inline]
 filemap_write_and_wait_range+0x4b/0xd0 mm/filemap.c:673
 generic_file_read_iter+0x1212/0x2b90 mm/filemap.c:2355
netlink: 104 bytes leftover after parsing attributes in process `syz-executor.5'.
 blkdev_read_iter+0x120/0x190 fs/block_dev.c:1947
 call_read_iter include/linux/fs.h:1814 [inline]
 do_iter_readv_writev+0x673/0x830 fs/read_write.c:679
 do_iter_read+0x268/0x640 fs/read_write.c:923
 vfs_readv+0xf0/0x160 fs/read_write.c:987
 do_preadv+0x1c4/0x280 fs/read_write.c:1071
 __do_sys_preadv fs/read_write.c:1121 [inline]
 __se_sys_preadv fs/read_write.c:1116 [inline]
 __x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1116
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c6c9
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3e6b8fcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f3e6b8fd6d4 RCX: 000000000045c6c9
RDX: 0000000000000001 RSI: 0000000020000040 RDI: 000000000000000f
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000851 R14: 00000000004cafb5 R15: 000000000076bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..