------------[ cut here ]------------
kernel BUG at fs/netfs/iterator.c:248!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 2 UID: 0 PID: 22997 Comm: syz.5.4474 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 58 07 74 fe e9 59 f6 ff ff e8 2e e5 b1 ff e9 6f f6 ff ff e8 64 56 45 ff 90 <0f> 0b e8 8c e4 b1 ff e9 cd f9 ff ff 4c 89 f6 48 c7 c7 60 c6 ab 8e
RSP: 0018:ffffc90003736d18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff82c37bab
RDX: ffff88803a3c4980 RSI: ffffffff82c38adc RDI: ffff88803a3c4980
RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000012 R12: 000000007fffffff
R13: 1ffff920006e6da9 R14: ffff888111eff320 R15: ffff888101b58b40
FS:  00007f9ceffa16c0(0000) GS:ffff8880d653f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000009b40 CR3: 00000000562bb000 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: 0033:0x400000002
Code: Unable to access opcode bytes at 0x3ffffffd8.
RSP: 002b:0000200000000008 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f9cef416090 RCX: 00007f9cef19c799
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000001144280
RBP: 00007f9cef232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f9cef416128 R14: 00007f9cef416090 R15: 00007ffe0dcb9398
 </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 58 07 74 fe e9 59 f6 ff ff e8 2e e5 b1 ff e9 6f f6 ff ff e8 64 56 45 ff 90 <0f> 0b e8 8c e4 b1 ff e9 cd f9 ff ff 4c 89 f6 48 c7 c7 60 c6 ab 8e
RSP: 0018:ffffc90003736d18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff82c37bab
RDX: ffff88803a3c4980 RSI: ffffffff82c38adc RDI: ffff88803a3c4980
RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000012 R12: 000000007fffffff
R13: 1ffff920006e6da9 R14: ffff888111eff320 R15: ffff888101b58b40
FS:  00007f9ceffa16c0(0000) GS:ffff8880d653f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000003ffffffd8 CR3: 00000000562bb000 CR4: 0000000000352ef0