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e48886b9d6
The ftrace blktrace path allocates buffers and writes trace events but was using the wrong recording function. After commit4d8bc7bd4f("blktrace: move ftrace blk_io_tracer to blk_io_trace2"), the ftrace interface was moved to use blk_io_trace2 format, but __blk_add_trace() still called record_blktrace_event() which writes in blk_io_trace (v1) format. This causes critical data corruption: - blk_io_trace (v1) has 32-bit 'action' field at offset 28 - blk_io_trace2 (v2) has 32-bit 'pid' at offset 28 and 64-bit 'action' at offset 32 - When record_blktrace_event() writes to a v2 buffer: * Writing pid (offset 32 in v1) corrupts the v2 action field * Writing action (offset 28 in v1) corrupts the v2 pid field * The 64-bit action is truncated to 32-bit via lower_32_bits() Fix by: 1. Adding version switch to select correct format (v1 vs v2) 2. Calling appropriate recording function based on version 3. Defaulting to v2 for ftrace (as intended by commit4d8bc7bd4f) 4. Adding WARN_ONCE for unexpected version values Without this patch :- linux-block (for-next) # sh reproduce_blktrace_bug.sh dd-14242 [033] d..1. 3903.022308: Unknown action 36a2 dd-14242 [033] d..1. 3903.022333: Unknown action 36a2 dd-14242 [033] d..1. 3903.022365: Unknown action 36a2 dd-14242 [033] d..1. 3903.022366: Unknown action 36a2 dd-14242 [033] d..1. 3903.022369: Unknown action 36a2 The action field is corrupted because: - ftrace allocated blk_io_trace2 buffer (64 bytes) - But called record_blktrace_event() (writes v1, 48 bytes) - Field offsets don't match, causing corruption The hex value shown 0x30e3 is actually a PID, not an action code! linux-block (for-next) # linux-block (for-next) # linux-block (for-next) # sh reproduce_blktrace_bug.sh Trace output looks correct: dd-2420 [019] d..1. 59.641742: 251,0 Q RS 0 + 8 [dd] dd-2420 [019] d..1. 59.641775: 251,0 G RS 0 + 8 [dd] dd-2420 [019] d..1. 59.641784: 251,0 P N [dd] dd-2420 [019] d..1. 59.641785: 251,0 U N [dd] 1 dd-2420 [019] d..1. 59.641788: 251,0 D RS 0 + 8 [dd] Fixes:4d8bc7bd4f("blktrace: move ftrace blk_io_tracer to blk_io_trace2") Signed-off-by: Chaitanya Kulkarni <ckulkarnilinux@gmail.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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 reStructuredText 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.