Re: [PATCH 7/9] mm: Free up PG_slab

[kernel test robot]

Hello,

kernel test robot noticed "UBSAN:shift-out-of-bounds_in_fs/proc/page.c" on:

commit: 30e5296811312a13938b83956a55839ac1e3aa40 ("[PATCH 7/9] mm: Free up PG_slab")
url: https://github.com/intel-lab-lkp/linux/commits/Matthew-Wilcox-Oracle/mm-Always-initialise-folio-_deferred_list/20240321-222800
base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 23956900041d968f9ad0f30db6dede4daccd7aa9
patch link: https://lore.kernel.org/all/20240321142448.1645400-8-willy@xxxxxxxxxxxxx/
patch subject: [PATCH 7/9] mm: Free up PG_slab

in testcase: ltp
version: ltp-x86_64-14c1f76-1_20240323
with following parameters:

	disk: 1HDD
	fs: ext4
	test: fs-00



compiler: gcc-12
test machine: 4 threads 1 sockets Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz (Ivy Bridge) with 8G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202403312344.c0d273ab-oliver.sang@xxxxxxxxx


kern  :warn  : [  528.627387] ------------[ cut here ]------------
kern  :err   : [  528.627589] UBSAN: shift-out-of-bounds in fs/proc/page.c:107:18
kern  :err   : [  528.627884] shift exponent 4096 is too large for 64-bit type 'long long unsigned int'
kern  :warn  : [  528.628200] CPU: 0 PID: 4703 Comm: proc01 Tainted: G S                 6.8.0-11774-g30e529681131 #1
kern  :warn  : [  528.628446] Hardware name: Hewlett-Packard p6-1451cx/2ADA, BIOS 8.15 02/05/2013
kern  :warn  : [  528.628659] Call Trace:
kern  :warn  : [  528.628814]  <TASK>
kern :warn : [  528.628960] dump_stack_lvl (lib/dump_stack.c:117 (discriminator 1)) 
kern :warn : [  528.629134] __ubsan_handle_shift_out_of_bounds (lib/ubsan.c:218 lib/ubsan.c:454) 
kern :warn : [  528.629360] stable_page_flags.part.0.cold (include/linux/page-flags.h:284 fs/proc/page.c:184) 
kern :warn : [  528.629506] kpageflags_read (fs/proc/page.c:238 fs/proc/page.c:250) 
kern :warn : [  528.629623] vfs_read (fs/read_write.c:474) 
kern :warn : [  528.629737] ? do_sys_openat2 (fs/open.c:1415) 
kern :warn : [  528.629898] ? kmem_cache_free (mm/slub.c:4280 mm/slub.c:4344) 
kern :warn : [  528.630063] ? __pfx_vfs_read (fs/read_write.c:457) 
kern :warn : [  528.630225] ? do_sys_openat2 (fs/open.c:1415) 
kern :warn : [  528.630388] ? __pfx_do_sys_openat2 (fs/open.c:1392) 
kern :warn : [  528.630552] ? __do_sys_newfstatat (fs/stat.c:464) 
kern :warn : [  528.630717] ? __fget_light (include/linux/atomic/atomic-arch-fallback.h:479 include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
kern :warn : [  528.630888] ksys_read (fs/read_write.c:619) 
kern :warn : [  528.631051] ? __pfx_ksys_read (fs/read_write.c:609) 
kern :warn : [  528.631216] ? kmem_cache_free (mm/slub.c:4280 mm/slub.c:4344) 
kern :warn : [  528.631415] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
kern :warn : [  528.631555] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
kern  :warn  : [  528.631756] RIP: 0033:0x7f90bf2ba19d
kern :warn : [ 528.631913] Code: 31 c0 e9 c6 fe ff ff 50 48 8d 3d 66 54 0a 00 e8 49 ff 01 00 66 0f 1f 84 00 00 00 00 00 80 3d 41 24 0e 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
All code
========
   0:	31 c0                	xor    %eax,%eax
   2:	e9 c6 fe ff ff       	jmpq   0xfffffffffffffecd
   7:	50                   	push   %rax
   8:	48 8d 3d 66 54 0a 00 	lea    0xa5466(%rip),%rdi        # 0xa5475
   f:	e8 49 ff 01 00       	callq  0x1ff5d
  14:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  1b:	00 00 
  1d:	80 3d 41 24 0e 00 00 	cmpb   $0x0,0xe2441(%rip)        # 0xe2465
  24:	74 17                	je     0x3d
  26:	31 c0                	xor    %eax,%eax
  28:	0f 05                	syscall 
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 5b                	ja     0x8d
  32:	c3                   	retq   
  33:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
  3a:	00 00 00 
  3d:	48                   	rex.W
  3e:	83                   	.byte 0x83
  3f:	ec                   	in     (%dx),%al

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 5b                	ja     0x63
   8:	c3                   	retq   
   9:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
  10:	00 00 00 
  13:	48                   	rex.W
  14:	83                   	.byte 0x83
  15:	ec                   	in     (%dx),%al
kern  :warn  : [  528.632309] RSP: 002b:00007ffe2eb3c008 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
kern  :warn  : [  528.632540] RAX: ffffffffffffffda RBX: 00007ffe2eb3d1b0 RCX: 00007f90bf2ba19d
kern  :warn  : [  528.632757] RDX: 0000000000000400 RSI: 000055e284e68c40 RDI: 0000000000000005
kern  :warn  : [  528.632960] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000073
kern  :warn  : [  528.633156] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
kern  :warn  : [  528.633399] R13: 000055e284e68c40 R14: 000055e2a975f8cb R15: 00007ffe2eb3d1b0
kern  :warn  : [  528.633645]  </TASK>
kern  :warn  : [  528.633813] ---[ end trace ]---



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240331/202403312344.c0d273ab-oliver.sang@xxxxxxxxx



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