syzbot

 generic_file_write_iter+0x36f/0x650 mm/filemap.c:3208
 call_write_iter include/linux/fs.h:1780 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
------------[ cut here ]------------
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
WARNING: CPU: 0 PID: 13561 at fs/super.c:1163 kill_block_super+0xbe/0xe0 fs/super.c:1163
Kernel panic - not syncing: panic_on_warn set ...

 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fba2a3e0e5f
RSP: 002b:00007fba289a0f10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fba2a3e0e5f
RDX: 0000000001000000 RSI: 00007fba20581000 RDI: 0000000000000004
RBP: 00007fba20581000 R08: 0000000000000000 R09: 00000000000050de
R10: 0000000001000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fba289a0fdc R14: 00007fba289a0fe0 R15: 00000000200051c2
CPU: 0 PID: 13561 Comm: syz-executor.5 Not tainted 4.14.301-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:967
RIP: 0010:kill_block_super+0xbe/0xe0 fs/super.c:1163
RSP: 0018:ffff88805a71fbb0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900069b9000
RDX: 0000000000040000 RSI: ffffffff818779fe RDI: ffff88809033dd30
RBP: ffff888059910600 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffff88809c5b4300 R12: ffff88809033d880
R13: ffffffff890a3cb0 R14: ffffffff88f45bc0 R15: dffffc0000000000
 cramfs_kill_sb+0x38/0x50 fs/cramfs/inode.c:247
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 sget_userns+0x9c4/0xc10 fs/super.c:537
 sget+0xd1/0x110 fs/super.c:572
 mount_bdev+0xcd/0x360 fs/super.c:1107
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a30 fs/namespace.c:2905
 SYSC_mount fs/namespace.c:3121 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3098
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f0bd704d60a
RSP: 002b:00007f0bd55bdf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000140 RCX: 00007f0bd704d60a
RDX: 0000000020000140 RSI: 0000000020000180 RDI: 00007f0bd55bdfe0
RBP: 00007f0bd55be020 R08: 00007f0bd55be020 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000140
R13: 0000000020000180 R14: 00007f0bd55bdfe0 R15: 00000000200001c0
CPU: 1 PID: 13578 Comm: syz-executor.2 Not tainted 4.14.301-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_fail_alloc_page mm/page_alloc.c:2898 [inline]
 prepare_alloc_pages mm/page_alloc.c:4165 [inline]
 __alloc_pages_nodemask+0x21e/0x2900 mm/page_alloc.c:4213
 alloc_pages_current+0x155/0x260 mm/mempolicy.c:2107
 alloc_pages include/linux/gfp.h:520 [inline]
 pte_alloc_one+0x15/0x100 arch/x86/mm/pgtable.c:30
 do_huge_pmd_anonymous_page+0x500/0x1700 mm/huge_memory.c:692
 create_huge_pmd mm/memory.c:4002 [inline]
 __handle_mm_fault+0x2ac4/0x4620 mm/memory.c:4205
 handle_mm_fault+0x455/0x9c0 mm/memory.c:4271
 __do_page_fault+0x549/0xad0 arch/x86/mm/fault.c:1442
 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1126
RIP: e3b04700:0x1
RSP: e3b04660:0000000000000102 EFLAGS: 7f0de3b04670
Kernel Offset: disabled
Rebooting in 86400 seconds..