general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__switch_to_asm+0x0/0x40 arch/x86/entry/entry_64.S:228 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 0018:ffffc90000cdfa38 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: ffff8880ae735e18 RCX: 0000000000000000 RDX: 1ffff11015ce6bc2 RSI: ffff88805c572580 RDI: ffff8880a95e01c0 RBP: ffffc90000cdfb08 R08: 0000000000000001 R09: ffff8880a95e0a88 R10: fffffbfff155cb09 R11: 0000000000000000 R12: ffff8880ae735e00 R13: ffff8880a95e01c0 R14: ffff88805c572580 R15: ffff8880a95e05f0 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc7acfa000 CR3: 000000005c575000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4436 idtentry_exit_cond_resched arch/x86/entry/common.c:621 [inline] idtentry_exit_cond_rcu+0xc0/0xf0 arch/x86/entry/common.c:668 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:__rcu_read_unlock+0xc/0x560 kernel/rcu/tree_plugin.h:389 Code: 51 00 4c 8b 4c 24 38 48 8b 74 24 30 48 8b 54 24 28 4c 8b 44 24 20 e9 4f f1 ff ff 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 56 41 55 41 54 55 65 48 8b 2c 25 00 ff 01 00 48 8d bd 78 03 00 RSP: 0018:ffffc90000cdfc00 EFLAGS: 00000293 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff87c98d1f RDX: ffff8880a95e01c0 RSI: ffffffff87c98c5a RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c58fa27 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88804f08d6d8 R14: ffff88804f08cbc0 R15: 000000000000007a rcu_read_unlock include/linux/rcupdate.h:687 [inline] batadv_nc_process_nc_paths.part.0+0x24f/0x3b0 net/batman-adv/network-coding.c:698 batadv_nc_process_nc_paths net/batman-adv/network-coding.c:678 [inline] batadv_nc_worker+0xaf2/0xe50 net/batman-adv/network-coding.c:727 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Modules linked in: ---[ end trace 58c4f014f04aedff ]--- RIP: 0010:__switch_to_asm+0x0/0x40 arch/x86/entry/entry_64.S:228 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 0018:ffffc90000cdfa38 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: ffff8880ae735e18 RCX: 0000000000000000 RDX: 1ffff11015ce6bc2 RSI: ffff88805c572580 RDI: ffff8880a95e01c0 RBP: ffffc90000cdfb08 R08: 0000000000000001 R09: ffff8880a95e0a88 R10: fffffbfff155cb09 R11: 0000000000000000 R12: ffff8880ae735e00 R13: ffff8880a95e01c0 R14: ffff88805c572580 R15: ffff8880a95e05f0 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc7acfa000 CR3: 000000005c575000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400