bisecting fixing commit since f873db9acd3c92d4741bc3676c9eb511b2f9a6f6 building syzkaller on 6436ce4bcd8e2c7dcca0b171ac91f51e96d973f8 testing commit f873db9acd3c92d4741bc3676c9eb511b2f9a6f6 with gcc (GCC) 8.4.1 20210217 kernel signature: c196333d61055a51843447eddd8c71c128677bd015e04f7517dcaabfa414350b run #0: crashed: WARNING: ODEBUG bug in bt_host_release run #1: crashed: KASAN: use-after-free Read in __queue_work run #2: crashed: WARNING: ODEBUG bug in bt_host_release run #3: crashed: WARNING: ODEBUG bug in bt_host_release run #4: crashed: WARNING: ODEBUG bug in bt_host_release run #5: crashed: WARNING: ODEBUG bug in bt_host_release run #6: crashed: WARNING: ODEBUG bug in bt_host_release run #7: crashed: WARNING: ODEBUG bug in bt_host_release run #8: crashed: general protection fault in __queue_work run #9: crashed: WARNING: ODEBUG bug in bt_host_release run #10: OK run #11: crashed: KASAN: use-after-free Read in __queue_work run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD f296bfd5cd04cbb49b8fc9585adc280ab2b58624 testing commit f296bfd5cd04cbb49b8fc9585adc280ab2b58624 with gcc (GCC) 10.2.1 20210217 kernel signature: 2d47d7fb6e676b9317e5a873978cae4187234d683e0dd0c9f4607f85d6fd0747 run #0: crashed: WARNING: ODEBUG bug in bt_host_release run #1: crashed: WARNING: ODEBUG bug in bt_host_release run #2: crashed: KASAN: use-after-free Read in __queue_work run #3: crashed: WARNING: ODEBUG bug in bt_host_release run #4: crashed: WARNING: ODEBUG bug in bt_host_release run #5: crashed: WARNING: ODEBUG bug in bt_host_release run #6: OK run #7: OK run #8: OK run #9: OK revisions tested: 2, total time: 29m27.916686705s (build: 11m18.328713671s, test: 17m30.540806572s) the crash still happens on HEAD commit msg: Merge tag 'nfs-for-5.12-2' of git://git.linux-nfs.org/projects/anna/linux-nfs crash: WARNING: ODEBUG bug in bt_host_release ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 arch/x86/include/asm/paravirt.h:658 WARNING: CPU: 0 PID: 16677 at lib/debugobjects.c:505 debug_print_object+0x160/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 0 PID: 16677 Comm: syz-executor.1 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:505 Code: dd 80 9e 12 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 80 9e 12 88 48 c7 c7 a0 93 12 88 e8 08 d8 ea 03 <0f> 0b 83 05 a3 05 e7 06 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 RSP: 0018:ffffc90001c67ab0 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff5200038cf48 RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8881f642095b R10: ffffed103ec8412b R11: 657461747320654f R12: ffffffff87cced00 R13: ffffffff815be1d0 R14: dead000000000100 R15: dffffc0000000000 FS: 00007f7dc4f7e700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7dc4f3c718 CR3: 000000011f5c3006 CR4: 00000000001706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:987 [inline] debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018 kfree+0xf7/0x2d0 mm/slab.c:3795 bt_host_release+0xc/0x20 net/bluetooth/hci_sysfs.c:86 device_release+0x93/0x200 drivers/base/core.c:2108 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0xf6/0x1d0 lib/kobject.c:753 hci_dev_put include/net/bluetooth/hci_core.h:1191 [inline] hci_dev_cmd+0x155/0x740 net/bluetooth/hci_core.c:2095 hci_sock_ioctl+0x313/0x630 net/bluetooth/hci_sock.c:1052 sock_do_ioctl+0xc6/0x210 net/socket.c:1039 sock_ioctl+0x3bf/0x570 net/socket.c:1179 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465029 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:00007f7dc4f7e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000055cfa0 RCX: 0000000000465029 RDX: 0000000020000040 RSI: 00000000400448dd RDI: 0000000000000004 RBP: 00000000004af6d2 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055cfa0 R13: 00007ffeda562fff R14: 00007f7dc4f7e300 R15: 0000000000022000 irq event stamp: 272 hardirqs last enabled at (271): [] kfree+0x22c/0x2d0 mm/slab.c:3797 hardirqs last disabled at (272): [] kfree+0x136/0x2d0 mm/slab.c:3786 softirqs last enabled at (202): [] hci_sock_ioctl+0x10c/0x630 net/bluetooth/hci_sock.c:1010 softirqs last disabled at (200): [] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (200): [] release_sock+0x16/0x170 net/core/sock.c:3078 ---[ end trace ebdba0763eeb8354 ]---