general protection fault, probably for non-canonical address 0xdffffc00000000b2: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000590-0x0000000000000597]
CPU: 1 PID: 4242 Comm: syz-executor.4 Not tainted 5.14.0-rc6-next-20210819-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:latency_exceeded block/blk-wbt.c:237 [inline]
RIP: 0010:wb_timer_fn+0x149/0x1750 block/blk-wbt.c:360
Code: 03 80 3c 02 00 0f 85 79 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 46 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00
RSP: 0018:ffffc90000dc0c98 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 00000000000000b2 RSI: ffffffff83d3ea3d RDI: 0000000000000590
RBP: ffff88801abedc00 R08: 0000000000000003 R09: ffff88801abedd83
R10: ffffffff83d3ea32 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000000 R14: ffff888146638380 R15: ffff88801abedcd0
FS:  00007f081c5ce700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c13b19c20 CR3: 00000000889fd000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x1ab/0x6c0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x133/0x190 kernel/softirq.c:636
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 <f3> aa c3 cc cc cc cc cc cc 41 57 41 56 41 55 41 54 55 53 48 89 fb
RSP: 0018:ffffc9000530f2e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000f40
RDX: ffffea00024c48c0 RSI: ffff888000000000 RDI: ffff8880931230c0
RBP: ffffea00024c48c0 R08: 0000160000000000 R09: ffffea00024c4900
R10: fffff9400049891e R11: ffffffff81b28b78 R12: 0000000000000000
R13: 0000000001141cca R14: 0000000000000001 R15: 0000000000000000
 clear_page arch/x86/include/asm/page_64.h:49 [inline]
 clear_highpage include/linux/highmem.h:218 [inline]
 kernel_init_free_pages mm/page_alloc.c:1278 [inline]
 kernel_init_free_pages mm/page_alloc.c:1263 [inline]
 post_alloc_hook+0x1c5/0x230 mm/page_alloc.c:2414
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa76/0x2f90 mm/page_alloc.c:4151
 __alloc_pages+0x1ba/0x510 mm/page_alloc.c:5373
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2188
 folio_alloc+0x1c/0x70 mm/mempolicy.c:2198
 filemap_alloc_folio mm/filemap.c:1030 [inline]
 __filemap_get_folio+0x5f2/0xe60 mm/filemap.c:1944
 pagecache_get_page+0x30/0x1a0 mm/folio-compat.c:125
 ext4_da_write_begin+0x35c/0x11a0 fs/ext4/inode.c:2984
 generic_perform_write+0x209/0x510 mm/filemap.c:3755
 ext4_buffered_write_iter+0x244/0x500 fs/ext4/file.c:269
 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x472/0x750 fs/read_write.c:740
 do_iter_write+0x18b/0x710 fs/read_write.c:866
 vfs_writev+0x1aa/0x630 fs/read_write.c:939
 do_pwritev fs/read_write.c:1036 [inline]
 __do_sys_pwritev fs/read_write.c:1083 [inline]
 __se_sys_pwritev fs/read_write.c:1078 [inline]
 __x64_sys_pwritev+0x231/0x310 fs/read_write.c:1078
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f081c5ce188 EFLAGS: 00000246 ORIG_RAX: 0000000000000128
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000018 RSI: 00000000200006c0 RDI: 0000000000000005
RBP: 00000000004bfcc4 R08: 0000000000000004 R09: 0000000000000000
R10: 000000000400fa7f R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffd273b3e6f R14: 00007f081c5ce300 R15: 0000000000022000
Modules linked in:
---[ end trace e63a76d3872c5004 ]---
RIP: 0010:latency_exceeded block/blk-wbt.c:237 [inline]
RIP: 0010:wb_timer_fn+0x149/0x1750 block/blk-wbt.c:360
Code: 03 80 3c 02 00 0f 85 79 13 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 90 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 46 13 00 00 48 8b 9b 90 05 00 00 48 b8 00 00 00
RSP: 0018:ffffc90000dc0c98 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 00000000000000b2 RSI: ffffffff83d3ea3d RDI: 0000000000000590
RBP: ffff88801abedc00 R08: 0000000000000003 R09: ffff88801abedd83
R10: ffffffff83d3ea32 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000000 R14: ffff888146638380 R15: ffff88801abedcd0
FS:  00007f081c5ce700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c13b19c20 CR3: 00000000889fd000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	03 80 3c 02 00 0f    	add    0xf00023c(%rax),%eax
   6:	85 79 13             	test   %edi,0x13(%rcx)
   9:	00 00                	add    %al,(%rax)
   b:	48 8b 9b c8 00 00 00 	mov    0xc8(%rbx),%rbx
  12:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  19:	fc ff df 
  1c:	48 8d bb 90 05 00 00 	lea    0x590(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 46 13 00 00    	jne    0x137a
  34:	48 8b 9b 90 05 00 00 	mov    0x590(%rbx),%rbx
  3b:	48                   	rex.W
  3c:	b8                   	.byte 0xb8
  3d:	00 00                	add    %al,(%rax)