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AKwUvBwfIj16jmVHeeRAA+NmajVwSY6V9K+G9tycG4jgskJSc6kwfUsuW80cQLjlyslH/+m5aDThUJy/db/A85E=@vger.kernel.org X-Gm-Message-State: AFuF++l9lgkXizXeWLPriJhE6GqKp/NdmQwi23LwCjvQgUbnJnJOO6U1 hq/eGGbrD0sgzypOtYuRvHTUhjshJz8RnnmwuXHexLjPrsqK+Ezru1hzLmFlkfB41Ty+kpxepZ9 poxkUhTLsfAbe3Zq6gx3r+953IyyEIIePiAiNNOZzzlqXChBpoc8GKO6+m90= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:8187:b0:6b7:46fa:16a6 with SMTP id 006d021491bc7-6bee7d17888mr2184433eaf.59.1788989726560; Wed, 09 Sep 2026 14:35:26 -0700 (PDT) Date: Wed, 09 Sep 2026 14:35:26 -0700 In-Reply-To: <6a9b44e0.a5e650b3.363816.0002.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa1d11e.f81106d8.2ab401.0001.GAE@google.com> Subject: Re: [syzbot] [block?] BUG: sleeping function called from invalid context in null_insert_page From: syzbot To: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 893e11787f78 Merge tag 'x86_urgent_for_7.3-rc3' of git://g.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=17e50925580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f dashboard link: https://syzkaller.appspot.com/bug?extid=95fdab36405e5ffdb680 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c13749580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+95fdab36405e5ffdb680@syzkaller.appspotmail.com null_blk: disk syzdev created BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 6031, name: syz-executor254 preempt_count: 0, expected: 0 RCU nest depth: 1, expected: 0 locks held by syz-executor254/6031: 1, last CPU#0: #0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: blk_mq_dispatch_queue_requests+0x148/0x7c0 block/blk-mq.c:2872 CPU: 0 UID: 0 PID: 6031 Comm: syz-executor254 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 __might_resched.cold+0x1dc/0x222 kernel/sched/core.c:9256 might_alloc include/linux/sched/mm.h:322 [inline] slab_pre_alloc_hook mm/slub.c:4636 [inline] slab_alloc_node mm/slub.c:4974 [inline] __kmalloc_cache_noprof+0x3e3/0x6d0 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] null_alloc_page drivers/block/null_blk/main.c:878 [inline] null_insert_page+0x10b/0x6c0 drivers/block/null_blk/main.c:1027 copy_to_nullb drivers/block/null_blk/main.c:1165 [inline] null_transfer drivers/block/null_blk/main.c:1279 [inline] null_handle_data_transfer+0x7df/0xe20 drivers/block/null_blk/main.c:1308 null_handle_memory_backed drivers/block/null_blk/main.c:1388 [inline] null_process_cmd+0x1e3/0x290 drivers/block/null_blk/main.c:1442 null_handle_cmd drivers/block/null_blk/main.c:1465 [inline] null_queue_rq+0x8e4/0xfb0 drivers/block/null_blk/main.c:1711 null_queue_rqs+0xe9/0x2f0 drivers/block/null_blk/main.c:1725 __blk_mq_flush_list block/blk-mq.c:2827 [inline] __blk_mq_flush_list+0x9a/0xc0 block/blk-mq.c:2823 blk_mq_dispatch_queue_requests+0x184/0x7c0 block/blk-mq.c:2872 blk_mq_flush_plug_list+0x1f2/0x600 block/blk-mq.c:2960 __blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1270 blk_finish_plug+0x5c/0xa0 block/blk-core.c:1297 blkdev_writepages+0xf6/0x150 block/fops.c:488 do_writepages+0x278/0x600 mm/page-writeback.c:2560 filemap_writeback+0x22d/0x2e0 mm/filemap.c:387 filemap_fdatawrite_range mm/filemap.c:412 [inline] file_write_and_wait_range+0xcd/0x140 mm/filemap.c:786 blkdev_fsync+0x6c/0xd0 block/fops.c:596 vfs_fsync_range fs/sync.c:186 [inline] vfs_fsync fs/sync.c:200 [inline] do_fsync+0xbf/0x220 fs/sync.c:211 __do_sys_fsync fs/sync.c:216 [inline] __se_sys_fsync fs/sync.c:214 [inline] __x64_sys_fsync+0x32/0x50 fs/sync.c:214 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f756122f3b7 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fffc74cf400 EFLAGS: 00000202 ORIG_RAX: 000000000000004a RAX: ffffffffffffffda RBX: 0000555566674400 RCX: 00007f756122f3b7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007f756126bae3 R13: 00007fffc74cf450 R14: 00007f7561268060 R15: 00007f7561268140 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.