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kernel BUG at fs/netfs/iterator.c:248!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 8843 Comm: syz.0.834 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:netfs_limit_iter+0x100d/0x1100 fs/netfs/iterator.c:248
Code: ff e9 a4 f4 ff ff 48 89 de 48 c7 c7 e0 c5 ab 8e e8 e8 09 74 fe e9 59 f6 ff ff e8 3e e7 b1 ff e9 6f f6 ff ff e8 f4 58 45 ff 90 <0f> 0b e8 9c e6 b1 ff e9 cd f9 ff ff 4c 89 f6 48 c7 c7 60 c6 ab 8e
RSP: 0018:ffffc90022076d18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff82c3791b
RDX: ffff8880280fc980 RSI: ffffffff82c3884c RDI: ffff8880280fc980
RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000012 R12: 000000007fffffff
R13: 1ffff9200440eda9 R14: ffff88802f74f1e0 R15: ffff888045b00b40
FS:  0000000000000000(0000) GS:ffff8880d643f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c4a7b6880 CR3: 0000000044e46000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 netfs_unbuffered_write+0x25d/0x2080 fs/netfs/direct_write.c:128
 netfs_unbuffered_write_iter_locked+0x801/0xab0 fs/netfs/direct_write.c:287
 netfs_unbuffered_write_iter+0x40c/0x710 fs/netfs/direct_write.c:377
 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409
 __kernel_write_iter+0x2ac/0x920 fs/read_write.c:621
 __kernel_write+0xf6/0x140 fs/read_write.c:641
 __dump_emit fs/coredump.c:1221 [inline]
 dump_emit+0x21f/0x330 fs/coredump.c:1259
 elf_core_dump+0x2127/0x3d10 fs/binfmt_elf.c:2062
 coredump_write fs/coredump.c:1050 [inline]
 do_coredump fs/coredump.c:1127 [inline]
 vfs_coredump+0x27bc/0x5570 fs/coredump.c:1201
 get_signal+0x1f2a/0x21e0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0x1f8/0x670 kernel/entry/common.c:219
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f1c49852777
Code: e8 8e fa ff ff 89 f2 48 8d 3d 0d 41 1b 00 48 8d 35 f4 fa 1d 00 31 c0 e8 e7 f8 ff ff 0f 1f 80 00 00 00 00 53 89 fb 48 83 ec 10 <64> 8b 04 25 a4 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007f1c4a7b71a0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f1c4999c799
RDX: 00007f1c4a7b71c0 RSI: 00007f1c4a7b72f0 RDI: 000000000000000b
RBP: 00007f1c49a32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f1c49c16038 R14: 00007f1c49c15fa0 R15: 00007ffc3bc597f8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:netfs_limit_iter+0x100d/0x1100 fs/netfs/iterator.c:248
Code: ff e9 a4 f4 ff ff 48 89 de 48 c7 c7 e0 c5 ab 8e e8 e8 09 74 fe e9 59 f6 ff ff e8 3e e7 b1 ff e9 6f f6 ff ff e8 f4 58 45 ff 90 <0f> 0b e8 9c e6 b1 ff e9 cd f9 ff ff 4c 89 f6 48 c7 c7 60 c6 ab 8e
RSP: 0018:ffffc90022076d18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff82c3791b
RDX: ffff8880280fc980 RSI: ffffffff82c3884c RDI: ffff8880280fc980
RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000012 R12: 000000007fffffff
R13: 1ffff9200440eda9 R14: ffff88802f74f1e0 R15: ffff888045b00b40
FS:  0000000000000000(0000) GS:ffff8880d663f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f653a1d4ff8 CR3: 0000000044e46000 CR4: 0000000000352ef0