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KASAN: slab-use-after-free Read in xfs_buf_rele

Status: moderation: reported on 2024/05/17 15:23
Subsystems: xfs
[Documentation on labels]
Reported-by: syzbot+f0cdbc7b4728f7f37c98@syzkaller.appspotmail.com
First crash: 18d, last: 18d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 KASAN: use-after-free Read in xfs_buf_rele xfs C 1 455d 525d 0/1 upstream: reported C repro on 2022/12/24 01:04
linux-4.19 KASAN: use-after-free Read in xfs_buf_rele syz error 3 453d 534d 0/1 upstream: reported syz repro on 2022/12/14 21:15

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in rht_key_hashfn include/linux/rhashtable.h:159 [inline]
BUG: KASAN: slab-use-after-free in rht_head_hashfn include/linux/rhashtable.h:174 [inline]
BUG: KASAN: slab-use-after-free in __rhashtable_remove_fast_one include/linux/rhashtable.h:1007 [inline]
BUG: KASAN: slab-use-after-free in __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline]
BUG: KASAN: slab-use-after-free in rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline]
BUG: KASAN: slab-use-after-free in xfs_buf_rele_cached fs/xfs/xfs_buf.c:1122 [inline]
BUG: KASAN: slab-use-after-free in xfs_buf_rele+0xb04/0x1238 fs/xfs/xfs_buf.c:1148
Read of size 4 at addr ffff0000d2c72c08 by task syz-executor.2/6411

CPU: 0 PID: 6411 Comm: syz-executor.2 Not tainted 6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 rht_key_hashfn include/linux/rhashtable.h:159 [inline]
 rht_head_hashfn include/linux/rhashtable.h:174 [inline]
 __rhashtable_remove_fast_one include/linux/rhashtable.h:1007 [inline]
 __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline]
 rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline]
 xfs_buf_rele_cached fs/xfs/xfs_buf.c:1122 [inline]
 xfs_buf_rele+0xb04/0x1238 fs/xfs/xfs_buf.c:1148
 xfs_buftarg_shrink_scan+0x200/0x298 fs/xfs/xfs_buf.c:2000
 do_shrink_slab+0x650/0x129c mm/shrinker.c:435
 shrink_slab+0xe9c/0x124c mm/shrinker.c:662
 drop_slab_node mm/vmscan.c:393 [inline]
 drop_slab+0x124/0x26c mm/vmscan.c:411
 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68
 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621
 call_write_iter include/linux/fs.h:2110 [inline]
 iter_file_splice_write+0x894/0xfc0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xec/0x1d8 fs/splice.c:1164
 splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x1e4/0x304 fs/splice.c:1233
 do_sendfile+0x460/0xb3c fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1348
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Allocated by task 6418:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3966 [inline]
 __kmalloc_node+0x2e8/0x548 mm/slub.c:3973
 kmalloc_node include/linux/slab.h:648 [inline]
 kvmalloc_node+0x88/0x24c mm/util.c:634
 kvmalloc include/linux/slab.h:766 [inline]
 kvzalloc include/linux/slab.h:774 [inline]
 bucket_table_alloc lib/rhashtable.c:184 [inline]
 rhashtable_init+0x444/0x8dc lib/rhashtable.c:1065
 xfs_buf_cache_init+0x44/0x54 fs/xfs/xfs_buf.c:520
 xfs_initialize_perag+0x3ec/0x914 fs/xfs/libxfs/xfs_ag.c:423
 xfs_mountfs+0x808/0x18dc fs/xfs/xfs_mount.c:801
 xfs_fs_fill_super+0xdf0/0x1040 fs/xfs/xfs_super.c:1730
 get_tree_bdev+0x320/0x470 fs/super.c:1614
 xfs_fs_get_tree+0x28/0x38 fs/xfs/xfs_super.c:1775
 vfs_get_tree+0x90/0x288 fs/super.c:1779
 do_new_mount+0x278/0x900 fs/namespace.c:3352
 path_mount+0x590/0xe04 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3875
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Freed by task 6269:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579
 poison_slab_object+0x124/0x18c mm/kasan/common.c:240
 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kfree+0x150/0x3e8 mm/slub.c:4390
 kvfree+0x40/0x50 mm/util.c:680
 bucket_table_free+0xec/0x1a4 lib/rhashtable.c:114
 rhashtable_free_and_destroy+0x768/0x8d0 lib/rhashtable.c:1163
 rhashtable_destroy+0x28/0x38 lib/rhashtable.c:1174
 xfs_buf_cache_destroy+0x20/0x30 fs/xfs/xfs_buf.c:527
 xfs_free_perag+0xe4/0x278 fs/xfs/libxfs/xfs_ag.c:267
 xfs_unmountfs+0x188/0x1dc fs/xfs/xfs_mount.c:1106
 xfs_fs_put_super+0x6c/0x124 fs/xfs/xfs_super.c:1134
 generic_shutdown_super+0x128/0x2b8 fs/super.c:641
 kill_block_super+0x44/0x90 fs/super.c:1675
 xfs_kill_sb+0x20/0x58 fs/xfs/xfs_super.c:2026
 deactivate_locked_super+0xc4/0x12c fs/super.c:472
 deactivate_super+0xe0/0x100 fs/super.c:505
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1267
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1274
 task_work_run+0x230/0x2e0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

The buggy address belongs to the object at ffff0000d2c72c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes inside of
 freed 512-byte region [ffff0000d2c72c00, ffff0000d2c72e00)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112c70
head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000840 ffff0000c0001c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
head: 05ffc00000000840 ffff0000c0001c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
head: 05ffc00000000002 fffffdffc34b1c01 fffffdffc34b1c48 00000000ffffffff
head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d2c72b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d2c72b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000d2c72c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff0000d2c72c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d2c72d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in lib/rhashtable.c:1182:34
shift exponent 4294901760 is too large for 32-bit type 'int'
CPU: 0 PID: 6411 Comm: syz-executor.2 Tainted: G    B              6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2f4/0x36c lib/ubsan.c:468
 __rht_bucket_nested+0x508/0x5b4 lib/rhashtable.c:1182
 rht_bucket_var include/linux/rhashtable.h:296 [inline]
 __rhashtable_remove_fast_one include/linux/rhashtable.h:1008 [inline]
 __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline]
 rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline]
 xfs_buf_rele_cached fs/xfs/xfs_buf.c:1122 [inline]
 xfs_buf_rele+0x9f4/0x1238 fs/xfs/xfs_buf.c:1148
 xfs_buftarg_shrink_scan+0x200/0x298 fs/xfs/xfs_buf.c:2000
 do_shrink_slab+0x650/0x129c mm/shrinker.c:435
 shrink_slab+0xe9c/0x124c mm/shrinker.c:662
 drop_slab_node mm/vmscan.c:393 [inline]
 drop_slab+0x124/0x26c mm/vmscan.c:411
 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68
 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621
 call_write_iter include/linux/fs.h:2110 [inline]
 iter_file_splice_write+0x894/0xfc0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xec/0x1d8 fs/splice.c:1164
 splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x1e4/0x304 fs/splice.c:1233
 do_sendfile+0x460/0xb3c fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1348
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
---[ end trace ]---
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in lib/rhashtable.c:1183:32
shift exponent 4294901760 is too large for 32-bit type 'unsigned int'
CPU: 0 PID: 6411 Comm: syz-executor.2 Tainted: G    B              6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2f4/0x36c lib/ubsan.c:468
 __rht_bucket_nested+0x5b0/0x5b4 lib/rhashtable.c:1183
 rht_bucket_var include/linux/rhashtable.h:296 [inline]
 __rhashtable_remove_fast_one include/linux/rhashtable.h:1008 [inline]
 __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline]
 rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline]
 xfs_buf_rele_cached fs/xfs/xfs_buf.c:1122 [inline]
 xfs_buf_rele+0x9f4/0x1238 fs/xfs/xfs_buf.c:1148
 xfs_buftarg_shrink_scan+0x200/0x298 fs/xfs/xfs_buf.c:2000
 do_shrink_slab+0x650/0x129c mm/shrinker.c:435
 shrink_slab+0xe9c/0x124c mm/shrinker.c:662
 drop_slab_node mm/vmscan.c:393 [inline]
 drop_slab+0x124/0x26c mm/vmscan.c:411
 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68
 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621
 call_write_iter include/linux/fs.h:2110 [inline]
 iter_file_splice_write+0x894/0xfc0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xec/0x1d8 fs/splice.c:1164
 splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x1e4/0x304 fs/splice.c:1233
 do_sendfile+0x460/0xb3c fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1348
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
---[ end trace ]---
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in lib/rhashtable.c:1189:10
shift exponent 4294901760 is too large for 32-bit type 'unsigned int'
CPU: 0 PID: 6411 Comm: syz-executor.2 Tainted: G    B              6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2f4/0x36c lib/ubsan.c:468
 __rht_bucket_nested+0x55c/0x5b4 lib/rhashtable.c:1189
 rht_bucket_var include/linux/rhashtable.h:296 [inline]
 __rhashtable_remove_fast_one include/linux/rhashtable.h:1008 [inline]
 __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline]
 rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline]
 xfs_buf_rele_cached fs/xfs/xfs_buf.c:1122 [inline]
 xfs_buf_rele+0x9f4/0x1238 fs/xfs/xfs_buf.c:1148
 xfs_buftarg_shrink_scan+0x200/0x298 fs/xfs/xfs_buf.c:2000
 do_shrink_slab+0x650/0x129c mm/shrinker.c:435
 shrink_slab+0xe9c/0x124c mm/shrinker.c:662
 drop_slab_node mm/vmscan.c:393 [inline]
 drop_slab+0x124/0x26c mm/vmscan.c:411
 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68
 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621
 call_write_iter include/linux/fs.h:2110 [inline]
 iter_file_splice_write+0x894/0xfc0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xec/0x1d8 fs/splice.c:1164
 splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x1e4/0x304 fs/splice.c:1233
 do_sendfile+0x460/0xb3c fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1348
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
---[ end trace ]---
Unable to handle kernel paging request at virtual address 001f7ff0001275f0
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[001f7ff0001275f0] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 6411 Comm: syz-executor.2 Tainted: G    B              6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __rht_bucket_nested+0x21c/0x5b4 lib/rhashtable.c:1193
lr : __rht_bucket_nested+0x318/0x5b4 lib/rhashtable.c:1191
sp : ffff800099776ec0
x29: ffff800099776ed0 x28: 00ffff800093af84 x27: ffff0000d2c72c04
x26: dfff800000000000 x25: 00ffff800093af84 x24: 00000000006a4a00
x23: 1ffff00011dd60cc x22: ffff0007776730d8 x21: 00000000000401ff
x20: 00000000006bda45 x19: 1fffe000eeece61b x18: 1fffe000367b8996
x17: ffff80008eead000 x16: ffff80008ae88ee0 x15: 0000000000000001
x14: 1fffe0001e0439a3 x13: 0000000000000000 x12: 000000001642ac51
x11: 0000000000040000 x10: 000000000003ffff x9 : ffff8000a0adb000
x8 : 001ffff0001275f0 x7 : 0000000000000000 x6 : ffff800081c93fe0
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800082f2ffd8
x2 : 00000000ffff0000 x1 : 00000000d7b48ae0 x0 : 00000000000401ff
Call trace:
 __rht_bucket_nested+0x21c/0x5b4 lib/rhashtable.c:1193
 rht_bucket_var include/linux/rhashtable.h:296 [inline]
 __rhashtable_remove_fast_one include/linux/rhashtable.h:1008 [inline]
 __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline]
 rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline]
 xfs_buf_rele_cached fs/xfs/xfs_buf.c:1122 [inline]
 xfs_buf_rele+0x9f4/0x1238 fs/xfs/xfs_buf.c:1148
 xfs_buftarg_shrink_scan+0x200/0x298 fs/xfs/xfs_buf.c:2000
 do_shrink_slab+0x650/0x129c mm/shrinker.c:435
 shrink_slab+0xe9c/0x124c mm/shrinker.c:662
 drop_slab_node mm/vmscan.c:393 [inline]
 drop_slab+0x124/0x26c mm/vmscan.c:411
 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68
 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621
 call_write_iter include/linux/fs.h:2110 [inline]
 iter_file_splice_write+0x894/0xfc0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xec/0x1d8 fs/splice.c:1164
 splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x1e4/0x304 fs/splice.c:1233
 do_sendfile+0x460/0xb3c fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1348
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: d343fed3 12002308 8b284f99 d343ff28 (387a6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	d343fed3 	lsr	x19, x22, #3
   4:	12002308 	and	w8, w24, #0x1ff
   8:	8b284f99 	add	x25, x28, w8, uxtw #3
   c:	d343ff28 	lsr	x8, x25, #3
* 10:	387a6908 	ldrb	w8, [x8, x26] <-- trapping instruction

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/13 15:11 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fda5695d692c 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-use-after-free Read in xfs_buf_rele
* Struck through repros no longer work on HEAD.