==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline]
BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:1131 [inline]
BUG: KASAN: use-after-free in consume_skb+0x3c/0x250 net/core/skbuff.c:926
Read of size 4 at addr ffff88811ce5086c by task syz.2.81/546

CPU: 0 PID: 546 Comm: syz.2.81 Not tainted 5.15.178-syzkaller-00013-g7d1f9b5c2ff5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
 refcount_read include/linux/refcount.h:147 [inline]
 skb_unref include/linux/skbuff.h:1131 [inline]
 consume_skb+0x3c/0x250 net/core/skbuff.c:926
 __sk_msg_free+0x2dd/0x370 net/core/skmsg.c:205
 sk_msg_free net/core/skmsg.c:218 [inline]
 __sk_psock_purge_ingress_msg net/core/skmsg.c:773 [inline]
 __sk_psock_zap_ingress net/core/skmsg.c:791 [inline]
 sk_psock_stop+0x4e3/0x580 net/core/skmsg.c:809
 sk_psock_drop+0x219/0x310 net/core/skmsg.c:848
 sk_psock_put include/linux/skmsg.h:463 [inline]
 sock_map_unref+0x3c6/0x430 net/core/sock_map.c:184
 __sock_map_delete net/core/sock_map.c:426 [inline]
 sock_map_delete_from_link net/core/sock_map.c:439 [inline]
 sock_map_unlink net/core/sock_map.c:1498 [inline]
 sock_map_remove_links+0x41c/0x650 net/core/sock_map.c:1513
 sock_map_close+0x114/0x530 net/core/sock_map.c:1550
 unix_release+0x82/0xc0 net/unix/af_unix.c:936
 __sock_release net/socket.c:649 [inline]
 sock_close+0xdf/0x270 net/socket.c:1336
 __fput+0x228/0x8c0 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:308
 task_work_run+0x129/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb484eea169
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffdfb15498 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb485104ba0 RCX: 00007fb484eea169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb485104ba0 R08: 0000000000000000 R09: 0000000ddfb1578f
R10: 000000000003fd68 R11: 0000000000000246 R12: 00000000000086fe
R13: 00007fffdfb15590 R14: ffffffffffffffff R15: 00007fffdfb155b0
 </TASK>

Allocated by task 554:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255
 skb_clone+0x1d1/0x360 net/core/skbuff.c:1547
 sk_psock_verdict_recv+0x53/0x840 net/core/skmsg.c:1187
 unix_read_sock+0x132/0x370 net/unix/af_unix.c:2428
 sk_psock_verdict_data_ready+0x147/0x1a0 net/core/skmsg.c:1230
 unix_dgram_sendmsg+0x15fa/0x2090 net/unix/af_unix.c:1942
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526
 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 303:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3521 [inline]
 kmem_cache_free+0x115/0x330 mm/slub.c:3539
 kfree_skbmem+0x104/0x170
 __kfree_skb net/core/skbuff.c:758 [inline]
 kfree_skb_reason net/core/skbuff.c:778 [inline]
 kfree_skb+0xc2/0x360 net/core/skbuff.c:792
 sock_drop include/linux/skmsg.h:312 [inline]
 sk_psock_backlog+0xad1/0xdc0 net/core/skmsg.c:684
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
 kthread+0x421/0x510 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff88811ce50780
 which belongs to the cache skbuff_head_cache of size 248
The buggy address is located 236 bytes inside of
 248-byte region [ffff88811ce50780, ffff88811ce50878)
The buggy address belongs to the page:
page:ffffea0004739400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ce50
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004736e40 0000000b0000000b ffff8881081ab680
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 139, ts 18170614869, free_ts 17661190706
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0x139/0x250 mm/slub.c:3255
 kmem_cache_alloc_node include/linux/slab.h:474 [inline]
 __alloc_skb+0xbe/0x550 net/core/skbuff.c:416
 alloc_skb include/linux/skbuff.h:1183 [inline]
 alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6194
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2539
 unix_dgram_sendmsg+0x6fd/0x2090 net/unix/af_unix.c:1805
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x39b/0x530 net/socket.c:1079
 do_iter_readv_writev+0x58e/0x790
 do_iter_write+0x1f1/0x760 fs/read_write.c:855
 vfs_writev+0x2ac/0x560 fs/read_write.c:928
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534
 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5856
 free_pages+0x7c/0x90 mm/page_alloc.c:5867
 _pgd_free arch/x86/mm/pgtable.c:420 [inline]
 pgd_free+0x17d/0x190 arch/x86/mm/pgtable.c:476
 mm_free_pgd kernel/fork.c:699 [inline]
 __mmdrop+0xb0/0x410 kernel/fork.c:750
 mmdrop include/linux/sched/mm.h:49 [inline]
 finish_task_switch+0x2cd/0x7b0 kernel/sched/core.c:5049
 context_switch kernel/sched/core.c:5155 [inline]
 __schedule+0xcd4/0x1590 kernel/sched/core.c:6512
 schedule+0x11f/0x1e0 kernel/sched/core.c:6595
 schedule_hrtimeout_range_clock+0x250/0x3a0 kernel/time/hrtimer.c:2309
 schedule_hrtimeout_range+0x2a/0x40 kernel/time/hrtimer.c:2372
 poll_schedule_timeout fs/select.c:243 [inline]
 do_poll fs/select.c:964 [inline]
 do_sys_poll+0xe15/0x12d0 fs/select.c:1014
 __do_sys_ppoll fs/select.c:1120 [inline]
 __se_sys_ppoll+0x29c/0x330 fs/select.c:1100
 __x64_sys_ppoll+0xbf/0xd0 fs/select.c:1100
 x64_sys_call+0x721/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:272
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
 ffff88811ce50700: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
 ffff88811ce50780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811ce50800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc
                                                          ^
 ffff88811ce50880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff88811ce50900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3521 [inline]
BUG: KASAN: double-free or invalid-free in kmem_cache_free+0x115/0x330 mm/slub.c:3539

CPU: 0 PID: 546 Comm: syz.2.81 Tainted: G    B             5.15.178-syzkaller-00013-g7d1f9b5c2ff5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 kasan_report_invalid_free+0x6b/0xa0 mm/kasan/report.c:370
 ____kasan_slab_free+0x13e/0x160
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3521 [inline]
 kmem_cache_free+0x115/0x330 mm/slub.c:3539
 kfree_skbmem+0x104/0x170
 __kfree_skb net/core/skbuff.c:758 [inline]
 consume_skb+0xb4/0x250 net/core/skbuff.c:930
 __sk_msg_free+0x2dd/0x370 net/core/skmsg.c:205
 sk_msg_free net/core/skmsg.c:218 [inline]
 __sk_psock_purge_ingress_msg net/core/skmsg.c:773 [inline]
 __sk_psock_zap_ingress net/core/skmsg.c:791 [inline]
 sk_psock_stop+0x4e3/0x580 net/core/skmsg.c:809
 sk_psock_drop+0x219/0x310 net/core/skmsg.c:848
 sk_psock_put include/linux/skmsg.h:463 [inline]
 sock_map_unref+0x3c6/0x430 net/core/sock_map.c:184
 __sock_map_delete net/core/sock_map.c:426 [inline]
 sock_map_delete_from_link net/core/sock_map.c:439 [inline]
 sock_map_unlink net/core/sock_map.c:1498 [inline]
 sock_map_remove_links+0x41c/0x650 net/core/sock_map.c:1513
 sock_map_close+0x114/0x530 net/core/sock_map.c:1550
 unix_release+0x82/0xc0 net/unix/af_unix.c:936
 __sock_release net/socket.c:649 [inline]
 sock_close+0xdf/0x270 net/socket.c:1336
 __fput+0x228/0x8c0 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:308
 task_work_run+0x129/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb484eea169
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffdfb15498 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb485104ba0 RCX: 00007fb484eea169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb485104ba0 R08: 0000000000000000 R09: 0000000ddfb1578f
R10: 000000000003fd68 R11: 0000000000000246 R12: 00000000000086fe
R13: 00007fffdfb15590 R14: ffffffffffffffff R15: 00007fffdfb155b0
 </TASK>

Allocated by task 554:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255
 skb_clone+0x1d1/0x360 net/core/skbuff.c:1547
 sk_psock_verdict_recv+0x53/0x840 net/core/skmsg.c:1187
 unix_read_sock+0x132/0x370 net/unix/af_unix.c:2428
 sk_psock_verdict_data_ready+0x147/0x1a0 net/core/skmsg.c:1230
 unix_dgram_sendmsg+0x15fa/0x2090 net/unix/af_unix.c:1942
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526
 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 303:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3521 [inline]
 kmem_cache_free+0x115/0x330 mm/slub.c:3539
 kfree_skbmem+0x104/0x170
 __kfree_skb net/core/skbuff.c:758 [inline]
 kfree_skb_reason net/core/skbuff.c:778 [inline]
 kfree_skb+0xc2/0x360 net/core/skbuff.c:792
 sock_drop include/linux/skmsg.h:312 [inline]
 sk_psock_backlog+0xad1/0xdc0 net/core/skmsg.c:684
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325
 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472
 kthread+0x421/0x510 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff88811ce50780
 which belongs to the cache skbuff_head_cache of size 248
The buggy address is located 0 bytes inside of
 248-byte region [ffff88811ce50780, ffff88811ce50878)
The buggy address belongs to the page:
page:ffffea0004739400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ce50
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004736e40 0000000b0000000b ffff8881081ab680
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 139, ts 18170614869, free_ts 17661190706
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0x139/0x250 mm/slub.c:3255
 kmem_cache_alloc_node include/linux/slab.h:474 [inline]
 __alloc_skb+0xbe/0x550 net/core/skbuff.c:416
 alloc_skb include/linux/skbuff.h:1183 [inline]
 alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6194
 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2539
 unix_dgram_sendmsg+0x6fd/0x2090 net/unix/af_unix.c:1805
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x39b/0x530 net/socket.c:1079
 do_iter_readv_writev+0x58e/0x790
 do_iter_write+0x1f1/0x760 fs/read_write.c:855
 vfs_writev+0x2ac/0x560 fs/read_write.c:928
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534
 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5856
 free_pages+0x7c/0x90 mm/page_alloc.c:5867
 _pgd_free arch/x86/mm/pgtable.c:420 [inline]
 pgd_free+0x17d/0x190 arch/x86/mm/pgtable.c:476
 mm_free_pgd kernel/fork.c:699 [inline]
 __mmdrop+0xb0/0x410 kernel/fork.c:750
 mmdrop include/linux/sched/mm.h:49 [inline]
 finish_task_switch+0x2cd/0x7b0 kernel/sched/core.c:5049
 context_switch kernel/sched/core.c:5155 [inline]
 __schedule+0xcd4/0x1590 kernel/sched/core.c:6512
 schedule+0x11f/0x1e0 kernel/sched/core.c:6595
 schedule_hrtimeout_range_clock+0x250/0x3a0 kernel/time/hrtimer.c:2309
 schedule_hrtimeout_range+0x2a/0x40 kernel/time/hrtimer.c:2372
 poll_schedule_timeout fs/select.c:243 [inline]
 do_poll fs/select.c:964 [inline]
 do_sys_poll+0xe15/0x12d0 fs/select.c:1014
 __do_sys_ppoll fs/select.c:1120 [inline]
 __se_sys_ppoll+0x29c/0x330 fs/select.c:1100
 __x64_sys_ppoll+0xbf/0xd0 fs/select.c:1100
 x64_sys_call+0x721/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:272
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
 ffff88811ce50680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811ce50700: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
>ffff88811ce50780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88811ce50800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc
 ffff88811ce50880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================