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syzbot reports this crash: BUG: unable to handle page fault for address: ffffffffffffffe8 PGD f96e17067 P4D f96e17067 PUD f96e19067 PMD 0 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI CPU: 55 PID: 211750 Comm: trinity-c127 Tainted: G B L 5.7.0-rc1-next-20200413 #4 Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 04/12/2017 RIP: 0010:__wake_up_common+0x98/0x290 el/sched/wait.c:87 Code: 40 4d 8d 78 e8 49 8d 7f 18 49 39 fd 0f 84 80 00 00 00 e8 6b bd 2b 00 49 8b 5f 18 45 31 e4 48 83 eb 18 4c 89 ff e8 08 bc 2b 00 <45> 8b 37 41 f6 c6 04 75 71 49 8d 7f 10 e8 46 bd 2b 00 49 8b 47 10 RSP: 0018:ffffc9000adbfaf0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffffffffffffffe8 RCX: ffffffffaa9636b8 RDX: 0000000000000003 RSI: dffffc0000000000 RDI: ffffffffffffffe8 RBP: ffffc9000adbfb40 R08: fffffbfff582c5fd R09: fffffbfff582c5fd R10: ffffffffac162fe3 R11: fffffbfff582c5fc R12: 0000000000000000 R13: ffff888ef82b0960 R14: ffffc9000adbfb80 R15: ffffffffffffffe8 FS: 00007fdcba4c4740(0000) GS:ffff889033780000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffe8 CR3: 0000000f776a0004 CR4: 00000000001606e0 Call Trace: __wake_up_common_lock+0xea/0x150 ommon_lock at kernel/sched/wait.c:124 ? __wake_up_common+0x290/0x290 ? lockdep_hardirqs_on+0x16/0x2c0 __wake_up+0x13/0x20 io_cqring_ev_posted+0x75/0xe0 v_posted at fs/io_uring.c:1160 io_ring_ctx_wait_and_kill+0x1c0/0x2f0 l at fs/io_uring.c:7305 io_uring_create+0xa8d/0x13b0 ? io_req_defer_prep+0x990/0x990 ? __kasan_check_write+0x14/0x20 io_uring_setup+0xb8/0x130 ? io_uring_create+0x13b0/0x13b0 ? check_flags.part.28+0x220/0x220 ? lockdep_hardirqs_on+0x16/0x2c0 __x64_sys_io_uring_setup+0x31/0x40 do_syscall_64+0xcc/0xaf0 ? syscall_return_slowpath+0x580/0x580 ? lockdep_hardirqs_off+0x1f/0x140 ? entry_SYSCALL_64_after_hwframe+0x3e/0xb3 ? trace_hardirqs_off_caller+0x3a/0x150 ? trace_hardirqs_off_thunk+0x1a/0x1c entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7fdcb9dd76ed Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d 6b 57 2c 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe7fd4e4f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00000000000001a9 RCX: 00007fdcb9dd76ed RDX: fffffffffffffffc RSI: 0000000000000000 RDI: 0000000000005d54 RBP: 00000000000001a9 R08: 0000000e31d3caa7 R09: 0082400004004000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000002 R13: 00007fdcb842e058 R14: 00007fdcba4c46c0 R15: 00007fdcb842e000 Modules linked in: bridge stp llc nfnetlink cn brd vfat fat ext4 crc16 mbcache jbd2 loop kvm_intel kvm irqbypass intel_cstate intel_uncore dax_pmem intel_rapl_perf dax_pmem_core ip_tables x_tables xfs sd_mod tg3 firmware_class libphy hpsa scsi_transport_sas dm_mirror dm_region_hash dm_log dm_mod [last unloaded: binfmt_misc] CR2: ffffffffffffffe8 ---[ end trace f9502383d57e0e22 ]--- RIP: 0010:__wake_up_common+0x98/0x290 Code: 40 4d 8d 78 e8 49 8d 7f 18 49 39 fd 0f 84 80 00 00 00 e8 6b bd 2b 00 49 8b 5f 18 45 31 e4 48 83 eb 18 4c 89 ff e8 08 bc 2b 00 <45> 8b 37 41 f6 c6 04 75 71 49 8d 7f 10 e8 46 bd 2b 00 49 8b 47 10 RSP: 0018:ffffc9000adbfaf0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffffffffffffffe8 RCX: ffffffffaa9636b8 RDX: 0000000000000003 RSI: dffffc0000000000 RDI: ffffffffffffffe8 RBP: ffffc9000adbfb40 R08: fffffbfff582c5fd R09: fffffbfff582c5fd R10: ffffffffac162fe3 R11: fffffbfff582c5fc R12: 0000000000000000 R13: ffff888ef82b0960 R14: ffffc9000adbfb80 R15: ffffffffffffffe8 FS: 00007fdcba4c4740(0000) GS:ffff889033780000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffe8 CR3: 0000000f776a0004 CR4: 00000000001606e0 Kernel panic - not syncing: Fatal exception Kernel Offset: 0x29800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) ---[ end Kernel panic - not syncing: Fatal exception ]— which is due to error injection (or allocation failure) preventing the rings from being setup. On shutdown, we attempt to remove any pending requests, and for poll request, we call io_cqring_ev_posted() when we've killed poll requests. However, since the rings aren't setup, we won't find any poll requests. Make the calling of io_cqring_ev_posted() dependent on actually having completed requests. This fixes this setup corner case, and removes spurious calls if we remove poll requests and don't find any. Reported-by: Qian Cai <cai@lca.pw> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.