ci2 starts bisection 2025-05-27 17:14:46.25757193 +0000 UTC m=+94771.447033207 bisecting fixing commit since 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef building syzkaller on 46eb10b79c61c4032281212d862c913683ab32a0 ensuring issue is reproducible on original commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef testing commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 66f4b3c1553708ead8b8ea098f5acef9079185dd75df75b5f00e94f37db5676d run #0: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #1: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #2: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #3: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #4: crashed: KASAN: use-after-free Read in ext4_read_inline_dir run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #6: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #7: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #8: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #9: crashed: KASAN: use-after-free Read in ext4_read_inline_dir run #10: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #11: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #12: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #13: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #14: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #15: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #16: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #17: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #18: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #19: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir representative crash: KASAN: slab-use-after-free Read in ext4_read_inline_dir, types: [KASAN] check whether we can drop unnecessary instrumentation disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG LOCKDEP], they are not needed testing commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: fa77697db9d925b38c9d051821df549dce658c2be15637ec548f02105ab7fdd5 run #0: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #1: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #2: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #3: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #4: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #5: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_dir run #8: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir run #9: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_dir representative crash: KASAN: slab-use-after-free Read in ext4_read_inline_dir, types: [KASAN] the bug reproduces without the instrumentation disabling configs for [LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG], they are not needed kconfig minimization: base=4084 full=8128 leaves diff=2136 split chunks (needed=false): <2136> split chunk #0 of len 2136 into 5 parts testing without sub-chunk 1/5 disabling configs for [BUG LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: a5c8788c29dd82ddd8b87faff40c28cf207ceae32720be9bff6c68521501666f run #0: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #1: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #3: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #5: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #7: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #8: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #9: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data representative crash: KASAN: slab-use-after-free Read in ext4_read_inline_data, types: [KASAN] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 78b3b798122be9c45442a0d4243fe86ada16c23c686d1c2ad39dbd6bf03f0beb run #0: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #2: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #3: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #5: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #6: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #7: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #8: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #9: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data representative crash: KASAN: slab-use-after-free Read in ext4_read_inline_data, types: [KASAN] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 9d58355b4f891c550f1e9bb0d4279145f810688c9993e65cdbe74a79cbc38d3d run #0: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #1: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #3: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #4: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #5: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #7: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #8: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #9: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data representative crash: KASAN: slab-use-after-free Read in ext4_read_inline_data, types: [KASAN] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [UBSAN BUG LOCKDEP ATOMIC_SLEEP HANG LEAK], they are not needed testing commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: d22aff2c491fe148876d55d879c6be117cb03595a18d11bfef5ad77e5f35c599 run #0: basic kernel testing failed: invalid opcode in __jump_label_patch run #1: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #3: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #4: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #5: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #6: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #8: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #9: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data representative crash: KASAN: slab-use-after-free Read in ext4_read_inline_data, types: [KASAN] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 910bfc26d16d07df5a2bfcbc63f0aa9d1397e2ef gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 632c55a3169c6ebec62be3ff91311fbf006cb14edc2e4f6da448c238a33d7215 run #0: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #3: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #5: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #6: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #7: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #8: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #9: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data representative crash: KASAN: slab-out-of-bounds Read in ext4_read_inline_data, types: [KASAN] the chunk can be dropped disabling configs for [HANG LEAK UBSAN BUG LOCKDEP ATOMIC_SLEEP], they are not needed testing current HEAD b1456f6dc167f7f101746e495bede2bac3d0e19f testing commit b1456f6dc167f7f101746e495bede2bac3d0e19f gcc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 kernel signature: 24111ed27394421042fc056a4acb04c77f782bac128be8f7188103e5f92b682b run #0: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #1: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #2: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #3: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #4: crashed: KASAN: slab-out-of-bounds Read in ext4_read_inline_data run #5: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #6: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #7: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #8: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data run #9: crashed: KASAN: slab-use-after-free Read in ext4_read_inline_data representative crash: KASAN: slab-use-after-free Read in ext4_read_inline_data, types: [KASAN] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 2h17m26.652238339s (build: 1h26m2.982676329s, test: 45m56.764861205s) crash still not fixed or there were kernel test errors commit msg: Merge tag 'timers-core-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip crash: KASAN: slab-use-after-free Read in ext4_read_inline_data EXT4-fs error (device loop0): ext4_readdir:264: inode #2: block 16: comm syz-executor: path /0/bus: bad entry in directory: rec_len is smaller than minimal - offset=980, inode=0, rec_len=0, size=1024 fake=0 ================================================================== BUG: KASAN: slab-use-after-free in ext4_read_inline_data+0x18f/0x280 fs/ext4/inline.c:214 Read of size 68 at addr ffff888116df751a by task syz-executor/1974 CPU: 1 UID: 0 PID: 1974 Comm: syz-executor Not tainted 6.15.0-syzkaller #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0xf4/0x170 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 ext4_read_inline_data+0x18f/0x280 fs/ext4/inline.c:214 ext4_read_inline_dir+0x2cd/0x940 fs/ext4/inline.c:1420 ext4_readdir+0x252/0x2d10 fs/ext4/dir.c:162 iterate_dir+0x1aa/0x4c0 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xd3/0x1b0 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7eff01d09333 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 02 45 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffca3b20c88 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555581250520 RCX: 00007eff01d09333 RDX: 0000000000008000 RSI: 0000555581250520 RDI: 0000000000000006 RBP: 00005555812504f4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000016 R14: 00005555812504f0 R15: 00007ffca3b24020 Allocated by task 1974: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1b1/0x400 mm/slub.c:4203 alloc_vfsmnt+0x1e/0x4a0 fs/namespace.c:350 clone_mnt+0x62/0xb50 fs/namespace.c:1351 copy_tree+0x3ad/0xb20 fs/namespace.c:2308 copy_mnt_ns+0x129/0x750 fs/namespace.c:4320 create_new_namespaces+0xca/0x690 kernel/nsproxy.c:78 unshare_nsproxy_namespaces+0xe0/0x120 kernel/nsproxy.c:218 ksys_unshare+0x3b6/0x720 kernel/fork.c:3390 __do_sys_unshare kernel/fork.c:3461 [inline] __se_sys_unshare kernel/fork.c:3459 [inline] __x64_sys_unshare+0x33/0x40 kernel/fork.c:3459 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 15: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free mm/slub.c:4642 [inline] kmem_cache_free+0x175/0x460 mm/slub.c:4744 rcu_do_batch kernel/rcu/tree.c:2576 [inline] rcu_core+0xbf1/0x1530 kernel/rcu/tree.c:2832 handle_softirqs+0x19a/0x500 kernel/softirq.c:579 run_ksoftirqd+0x28/0x40 kernel/softirq.c:968 smpboot_thread_fn+0x3f4/0x7d0 kernel/smpboot.c:164 kthread+0x59b/0x690 kernel/kthread.c:464 ret_from_fork+0x136/0x2d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3090 [inline] call_rcu+0x141/0x7d0 kernel/rcu/tree.c:3210 task_work_run+0x149/0x1e0 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x181/0x250 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Second to last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 task_work_add+0x95/0x290 kernel/task_work.c:65 mntput_no_expire+0x3fa/0x670 fs/namespace.c:1511 mntput fs/namespace.c:1528 [inline] namespace_unlock+0x53e/0x5b0 fs/namespace.c:1821 do_umount fs/namespace.c:2059 [inline] path_umount+0xc96/0xd20 fs/namespace.c:2142 ksys_umount fs/namespace.c:2165 [inline] __do_sys_umount fs/namespace.c:2170 [inline] __se_sys_umount fs/namespace.c:2168 [inline] __x64_sys_umount+0xe4/0x120 fs/namespace.c:2168 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888116df7500 which belongs to the cache mnt_cache of size 368 The buggy address is located 26 bytes inside of freed 368-byte region [ffff888116df7500, ffff888116df7670) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116df6 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888107ffd201 anon flags: 0x200000000000040(head|node=0|zone=2) page_type: f5(slab) raw: 0200000000000040 ffff888100e83c80 ffffea000453d180 0000000000000003 raw: 0000000000000000 0000000080120012 00000000f5000000 ffff888107ffd201 head: 0200000000000040 ffff888100e83c80 ffffea000453d180 0000000000000003 head: 0000000000000000 0000000080120012 00000000f5000000 ffff888107ffd201 head: 0200000000000001 ffffea00045b7d81 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 970, tgid 970 (syz-executor), ts 47194335666, free_ts 47186377498 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x168/0x1a0 mm/page_alloc.c:1714 prep_new_page mm/page_alloc.c:1722 [inline] get_page_from_freelist+0x2d16/0x2ee0 mm/page_alloc.c:3684 __alloc_frozen_pages_noprof+0x26b/0x460 mm/page_alloc.c:4974 alloc_pages_mpol+0xcb/0x270 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab+0x8a/0x350 mm/slub.c:2618 new_slab mm/slub.c:2672 [inline] ___slab_alloc+0x9dc/0x10e0 mm/slub.c:3858 __slab_alloc mm/slub.c:3948 [inline] __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] kmem_cache_alloc_noprof+0x26e/0x400 mm/slub.c:4203 alloc_vfsmnt+0x1e/0x4a0 fs/namespace.c:350 clone_mnt+0x62/0xb50 fs/namespace.c:1351 copy_tree+0x3ad/0xb20 fs/namespace.c:2308 copy_mnt_ns+0x129/0x750 fs/namespace.c:4320 create_new_namespaces+0xca/0x690 kernel/nsproxy.c:78 unshare_nsproxy_namespaces+0xe0/0x120 kernel/nsproxy.c:218 ksys_unshare+0x3b6/0x720 kernel/fork.c:3390 __do_sys_unshare kernel/fork.c:3461 [inline] __se_sys_unshare kernel/fork.c:3459 [inline] __x64_sys_unshare+0x33/0x40 kernel/fork.c:3459 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94 page last free pid 901 tgid 901 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1258 [inline] __free_frozen_pages+0xa1a/0xbe0 mm/page_alloc.c:2721 mm_free_pgd kernel/fork.c:794 [inline] __mmdrop+0x50/0x2a0 kernel/fork.c:940 mmdrop include/linux/sched/mm.h:55 [inline] mmdrop_sched include/linux/sched/mm.h:83 [inline] mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline] finish_task_switch+0x397/0x670 kernel/sched/core.c:5285 context_switch kernel/sched/core.c:5395 [inline] __schedule+0x151d/0x23c0 kernel/sched/core.c:6781 __schedule_loop kernel/sched/core.c:6859 [inline] schedule+0x112/0x2f0 kernel/sched/core.c:6874 schedule_hrtimeout_range_clock+0x11a/0x260 kernel/time/sleep_timeout.c:216 poll_schedule_timeout+0x6f/0x100 fs/select.c:241 do_select+0x10d2/0x11f0 fs/select.c:603 core_sys_select+0x404/0x5d0 fs/select.c:677 do_pselect fs/select.c:759 [inline] __do_sys_pselect6 fs/select.c:802 [inline] __se_sys_pselect6+0x1d2/0x250 fs/select.c:793 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888116df7400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888116df7480: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc >ffff888116df7500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888116df7580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888116df7600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ==================================================================