BUG: unable to handle page fault for address: fffffbfff2c81246 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 21ffe5067 P4D 21ffe5067 PUD 21ffe4067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:91 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:108 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:183 [inline] RIP: 0010:check_memory_region+0xdb/0x180 mm/kasan/generic.c:192 Code: 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 <80> 38 00 74 f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d 8d 1c RSP: 0018:ffffc90000cbf8c0 EFLAGS: 00010086 RAX: fffffbfff2c81246 RBX: fffffbfff2c81247 RCX: ffffffff815a1a7e RDX: fffffbfff2c81247 RSI: 0000000000000008 RDI: ffffffff96409230 RBP: fffffbfff2c81246 R08: 0000000000000000 R09: ffffffff96409237 R10: fffffbfff2c81246 R11: 000000000009f828 R12: 0000000000000000 R13: ffff8880a95e2ad2 R14: ffff8880a95e2140 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff2c81246 CR3: 000000005ddcc000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:56 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] __lock_acquire+0xfbe/0x5640 kernel/locking/lockdep.c:4396 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] lock_sock_nested+0x3b/0x110 net/core/sock.c:3048 l2cap_sock_teardown_cb+0x88/0x400 net/bluetooth/l2cap_sock.c:1520 l2cap_chan_del+0xad/0x1300 net/bluetooth/l2cap_core.c:618 l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:823 l2cap_chan_timeout+0x173/0x450 net/bluetooth/l2cap_core.c:436 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: CR2: fffffbfff2c81246 ---[ end trace c5998797b8a8b584 ]--- RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:91 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:108 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:183 [inline] RIP: 0010:check_memory_region+0xdb/0x180 mm/kasan/generic.c:192 Code: 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 <80> 38 00 74 f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d 8d 1c RSP: 0018:ffffc90000cbf8c0 EFLAGS: 00010086 RAX: fffffbfff2c81246 RBX: fffffbfff2c81247 RCX: ffffffff815a1a7e RDX: fffffbfff2c81247 RSI: 0000000000000008 RDI: ffffffff96409230 RBP: fffffbfff2c81246 R08: 0000000000000000 R09: ffffffff96409237 R10: fffffbfff2c81246 R11: 000000000009f828 R12: 0000000000000000 R13: ffff8880a95e2ad2 R14: ffff8880a95e2140 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff2c81246 CR3: 000000005ddcc000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400