rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=42f/1/0x4000000000000002 softirq=14306/14308 fqs=5245 (detected by 1, t=10502 jiffies, g=18317, q=894) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8200 Comm: syz-executor.5 Not tainted 5.16.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x60 kernel/kcov.c:200 Code: be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 59 dd 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 00 01 ff 00 74 0e 85 c9 74 35 8b 82 a4 15 00 00 85 c0 74 2b 8b RSP: 0018:ffffc90000007ae8 EFLAGS: 00000006 RAX: 0000000000000101 RBX: 0000000000000001 RCX: 0000000000000100 RDX: ffff88807b40d700 RSI: ffffffff8181835e RDI: ffff88807b40db3c RBP: ffff888018d07b28 R08: 0000000000000000 R09: ffffffff8d9206c7 R10: ffffffff8183b36a R11: 0000000000000000 R12: 00000000ffffffea R13: dffffc0000000000 R14: 0000000000000000 R15: ffffe8ffffccc000 FS: 00007f9d107a3700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555566ac848 CR3: 0000000055d56000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_release include/linux/rcupdate.h:273 [inline] rcu_read_unlock include/linux/rcupdate.h:721 [inline] BPF_PROG_RUN_ARRAY include/linux/bpf.h:1364 [inline] trace_call_bpf+0x2fe/0x5f0 kernel/trace/bpf_trace.c:127 perf_trace_run_bpf_submit+0x91/0x210 kernel/events/core.c:9708 perf_trace_preemptirq_template+0x296/0x460 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline] trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline] trace_hardirqs_on+0x156/0x1c0 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:664 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__rcu_read_unlock+0xc4/0x570 kernel/rcu/tree_plugin.h:425 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e b6 01 00 00 8b 85 40 04 00 00 85 c0 75 54 <65> 48 8b 1c 25 40 70 02 00 48 8d bb 3c 04 00 00 48 b8 00 00 00 00 RSP: 0018:ffffc90000007dc0 EFLAGS: 00000206 RAX: 0000000000000002 RBX: ffff8880b9c3a900 RCX: 1ffffffff1ffac0e RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffffffff8bb8cb00 R08: 0000000000000001 R09: ffffffff8ff9ba9f R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff8544cb00 R14: 0000000000000200 R15: ffffffff854479b0 rcu_read_unlock include/linux/rcupdate.h:720 [inline] ieee80211_iterate_active_interfaces_atomic+0x92/0x180 net/mac80211/util.c:831 mac80211_hwsim_beacon+0xcd/0x1c0 drivers/net/wireless/mac80211_hwsim.c:1861 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:bio_crypt_ctx_back_mergeable block/blk-crypto-internal.h:34 [inline] RIP: 0010:ll_back_merge_fn block/blk-merge.c:630 [inline] RIP: 0010:ll_back_merge_fn+0x3b9/0xe70 block/blk-merge.c:623 Code: 4d 21 fd 4c 89 ee e8 d6 69 b0 fd 4d 85 ed 74 1a 45 31 e4 e8 39 67 b0 fd 44 89 e0 48 83 c4 30 5b 5d 41 5c 41 5d 41 5e 41 5f c3 22 67 b0 fd 49 8d 7c 24 60 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffffc900028ef450 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88801d0a7400 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88807b40d700 RDI: 0000000000000003 RBP: ffff88801d0a7418 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff83c72883 R11: 0000000000000000 R12: ffff8880218f5640 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801a983780 bio_attempt_back_merge+0x4f/0x580 block/blk-merge.c:968 blk_attempt_bio_merge.part.0+0x413/0x4c0 block/blk-merge.c:1050 blk_attempt_bio_merge block/blk-merge.c:1044 [inline] blk_attempt_plug_merge+0x1bc/0x210 block/blk-merge.c:1105 blk_mq_attempt_bio_merge block/blk-mq.c:2504 [inline] blk_mq_attempt_bio_merge block/blk-mq.c:2499 [inline] blk_mq_get_new_requests block/blk-mq.c:2525 [inline] blk_mq_get_request block/blk-mq.c:2591 [inline] blk_mq_submit_bio+0x153c/0x22b0 block/blk-mq.c:2633 __submit_bio block/blk-core.c:851 [inline] __submit_bio_noacct_mq block/blk-core.c:926 [inline] submit_bio_noacct block/blk-core.c:952 [inline] submit_bio_noacct+0x82c/0xa20 block/blk-core.c:941 submit_bio block/blk-core.c:1013 [inline] submit_bio+0x1ea/0x430 block/blk-core.c:971 iomap_dio_submit_bio+0x1a8/0x200 fs/iomap/direct-io.c:65 iomap_dio_bio_iter+0xcf7/0x1560 fs/iomap/direct-io.c:350 iomap_dio_iter fs/iomap/direct-io.c:433 [inline] __iomap_dio_rw+0x84a/0x1a10 fs/iomap/direct-io.c:589 iomap_dio_rw+0x38/0x90 fs/iomap/direct-io.c:679 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xe1b/0x14e0 fs/ext4/file.c:679 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9d11e2deb9 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:00007f9d107a3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9d11f40f60 RCX: 00007f9d11e2deb9 RDX: 000000000020b000 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f9d11e8808d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5e94e29f R14: 00007f9d107a3300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: be b0 01 00 00 mov $0x1b0,%esi 5: e8 b4 ff ff ff callq 0xffffffbe a: 31 c0 xor %eax,%eax c: c3 retq d: 90 nop e: 65 8b 05 59 dd 8a 7e mov %gs:0x7e8add59(%rip),%eax # 0x7e8add6e 15: 89 c1 mov %eax,%ecx 17: 48 8b 34 24 mov (%rsp),%rsi 1b: 81 e1 00 01 00 00 and $0x100,%ecx 21: 65 48 8b 14 25 40 70 mov %gs:0x27040,%rdx 28: 02 00 * 2a: a9 00 01 ff 00 test $0xff0100,%eax <-- trapping instruction 2f: 74 0e je 0x3f 31: 85 c9 test %ecx,%ecx 33: 74 35 je 0x6a 35: 8b 82 a4 15 00 00 mov 0x15a4(%rdx),%eax 3b: 85 c0 test %eax,%eax 3d: 74 2b je 0x6a 3f: 8b .byte 0x8b